Add postgresql support, similar to mariadb(at this juncture).

+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - ./restore-from-empty.yaml
+

+apiVersion: batch/v1
+kind: Job
+metadata:
+  name: postgresql-restore-from-empty
+spec:
+  #replicas: 1
+  #progressDeadlineSeconds: 600
+  template:
+    spec:
+      restartPolicy: OnFailure
+      securityContext:
+        runAsUser: 0
+        runAsGroup: 0
+
+      volumes:
+        - name: postgresql-entrypoint-initdb
+          persistentVolumeClaim:
+            claimName: postgresql-entrypoint-initdb
+        - name: postgresql-scripts
+          configMap:
+            name: postgresql-scripts
+            defaultMode: 0755
+
+      containers:
+        - name: restore-from-empty
+          image: debian
+          command: ["/scripts/restore-from-empty"]
+          volumeMounts:
+            - name: postgresql-entrypoint-initdb
+              mountPath: /docker-entrypoint-initdb.d
+            - name: postgresql-scripts
+              mountPath: /scripts
+

+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: postgresql-config
+data:
+  POSTGRESQL_DATABASE: ""
+  POSTGRESQL_USER: ""
+---
+apiVersion: v1
+kind: Secret
+metadata:
+  name: postgresql-secret
+stringData:
+  POSTGRESQL_PASSWORD: "CHANGEME"
+  POSTGRESQL_POSTGRES_PASSWORD: "CHANGEME"
+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: postgresql-data
+spec:
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 10Gi
+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: postgresql-entrypoint-initdb
+spec:
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 10Gi
+---
+
+

+environments:
+  default:
+    values:
+      - namespace: postgresql
+        namePrefix: "test-"
+        restoreFromEmpty:
+          enabled: true
+        postgresqlServer:
+          jsonPatches: []
+          strategicMergePatches: []
+          postgresPassword: CHANGEME
+          password: CHANGEME
+          database: CHANGEME
+          user: CHANGEME
+        images:
+          debian: "debian:bullseye-20211220"
+          postgresql: "bitnami/postgresql:14.1.0-debian-10-r66"
+
+releases:
+
+  - name: {{ .Values.namePrefix }}postgresql-restore-from-empty
+    namespace: {{ .Values.namespace }}
+    chart: charts/restore-from-empty
+    condition: restoreFromEmpty.enabled
+    values:
+      - set-common-values.yaml.gotmpl
+    strategicMergePatches:
+      - apiVersion: batch/v1
+        kind: Job
+        metadata:
+          name: {{ .Values.namePrefix }}postgresql-restore-from-empty
+          namespace: {{ .Values.namespace }}
+        spec:
+          template:
+            spec:
+              volumes:
+                - name: postgresql-entrypoint-initdb
+                  persistentVolumeClaim:
+                    claimName: {{ .Values.namePrefix }}postgresql-entrypoint-initdb
+                - name: postgresql-scripts
+                  configMap:
+                    name: {{ .Values.namePrefix }}postgresql-scripts
+
+  - name: {{ .Values.namePrefix }}postgresql-server
+    namespace: {{ .Values.namespace }}
+    chart: .
+    values:
+      - set-common-values.yaml.gotmpl
+    jsonPatches:
+      {{- if not (empty (.Values.postgresqlServer.jsonPatches)) }}
+      {{- .Values.postgresqlServer.jsonPatches | toYaml | indent 6 }}
+      {{- end }}
+    strategicMergePatches:
+      - apiVersion: apps/v1
+        kind: Deployment
+        metadata:
+          name: {{ .Values.namePrefix }}postgresql-server
+          namespace: {{ .Values.namespace }}
+        spec:
+          selector:
+            matchLabels:
+              app: {{ .Values.namePrefix }}postgresql-server
+          template:
+            metadata:
+              labels:
+                app: {{ .Values.namePrefix }}postgresql-server
+            spec:
+              volumes:
+                - name: postgresql-data
+                  persistentVolumeClaim:
+                    claimName: {{ .Values.namePrefix }}postgresql-data
+                - name: postgresql-config
+                  configMap:
+                    name: {{ .Values.namePrefix }}postgresql-config
+                - name: postgresql-scripts
+                  configMap:
+                    name: {{ .Values.namePrefix }}postgresql-scripts
+                - name: postgresql-secret
+                  secret:
+                    secretName: {{ .Values.namePrefix }}postgresql-secret
+      - apiVersion: v1
+        kind: Service
+        metadata:
+          name: {{ .Values.namePrefix }}postgresql
+          namespace: {{ .Values.namespace }}
+        spec:
+          selector:
+            app: {{ .Values.namePrefix }}postgresql-server
+      - apiVersion: v1
+        kind: ConfigMap
+        metadata:
+          name: {{ .Values.namePrefix }}postgresql-config
+          namespace: {{ .Values.namespace }}
+        data:
+          POSTGRESQL_DATABASE: {{ .Values.postgresqlServer.database }}
+          POSTGRESQL_USER: {{ .Values.postgresqlServer.user }}
+      - apiVersion: v1
+        kind: Secret
+        metadata:
+          name: {{ .Values.namePrefix }}postgresql-secret
+          namespace: {{ .Values.namespace }}
+        stringData:
+          POSTGRESQL_PASSWORD: {{ .Values.postgresqlServer.password }}
+          POSTGRESQL_POSTGRES_PASSWORD: {{ .Values.postgresqlServer.postgresPassword }}
+      {{- if not (empty (.Values.postgresqlServer.strategicMergePatches)) }}
+      {{- .Values.postgresqlServer.strategicMergePatches | toYaml | indent 6 }}
+      {{- end }}
+

+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - ./config.yaml
+  - ./postgresql-server.yaml
+
+generatorOptions:
+  disableNameSuffixHash: true
+configMapGenerator:
+  - name: postgresql-scripts
+    files:
+      - ./scripts/wait-for-file
+      - ./scripts/restore-from-empty
+      - ./scripts/bitnami-postgresql-entrypoint-container.sh
+      - ./scripts/bitnami-postgresql-entrypoint-initContainer.sh
+

+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: postgresql
+spec:
+  selector:
+    app: postgresql-server
+  ports:
+    - name: mysql
+      protocol: TCP
+      port: 5432
+      targetPort: 5432
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: postgresql-server
+  labels:
+    app: postgresql-server
+spec:
+  replicas: 1
+  progressDeadlineSeconds: 600
+  selector:
+    matchLabels:
+      app: postgresql-server
+  template:
+    metadata:
+      labels:
+        app: postgresql-server
+    spec:
+      restartPolicy: Always
+      securityContext:
+        runAsUser: 0
+        runAsGroup: 0
+
+      volumes:
+        - name: postgresql-data
+          persistentVolumeClaim:
+            claimName: postgresql-data
+        - name: postgresql-entrypoint-initdb
+          persistentVolumeClaim:
+            claimName: postgresql-entrypoint-initdb
+        - name: postgresql-scripts
+          configMap:
+            name: postgresql-scripts
+            defaultMode: 0755
+        - name: postgresql-config
+          configMap:
+            name: postgresql-config
+        - name: postgresql-secret
+          secret:
+            secretName: postgresql-secret
+        - name: database-restore
+          emptyDir: {}
+        - name: etc
+          emptyDir: {}
+
+      initContainers:
+        - name: wait-for-file
+          image: debian
+          command: ["/scripts/wait-for-file"]
+          volumeMounts:
+            - name: postgresql-entrypoint-initdb
+              mountPath: /docker-entrypoint-initdb.d
+            - name: postgresql-scripts
+              mountPath: /scripts
+          env:
+            - name: WAIT_FOR_FILE
+              value: /docker-entrypoint-initdb.d/.restored
+
+        - name: init-postgresql
+          image: postgresql
+          command: ["/var/scripts/bitnami-postgresql-entrypoint-initContainer.sh"]
+          volumeMounts:
+            - name: postgresql-scripts
+              mountPath: /var/scripts
+            - name: postgresql-data
+              mountPath: /bitnami/postgresql
+            - name: postgresql-config
+              mountPath: /var/postgresql-config
+            - name: postgresql-secret
+              mountPath: /var/postgresql-secret
+            - name: postgresql-entrypoint-initdb
+              mountPath: /docker-entrypoint-initdb.d
+            - name: etc
+              mountPath: /runtime-etc
+          env:
+            - name: POSTGRESQL_DATABASE_FILE
+              value: /var/postgresql-config/POSTGRESQL_DATABASE
+            - name: POSTGRESQL_USER_FILE
+              value: /var/postgresql-config/POSTGRESQL_USER
+            - name: POSTGRESQL_PASSWORD_FILE
+              value: /var/postgresql-secret/POSTGRESQL_PASSWORD
+            - name: POSTGRESQL_POSTGRES_PASSWORD_FILE
+              value: /var/postgresql-secret/POSTGRESQL_POSTGRES_PASSWORD
+
+      containers:
+        - name: postgresql
+          image: postgresql
+          #securityContext:
+          #  runAsUser: 1001
+          #  runAsGroup: 1001
+          command: ["/var/scripts/bitnami-postgresql-entrypoint-container.sh"]
+          args: ["/opt/bitnami/scripts/postgresql/run.sh"]
+          volumeMounts:
+            - name: postgresql-scripts
+              mountPath: /var/scripts
+            - name: postgresql-data
+              mountPath: /bitnami/postgresql
+            - name: etc
+              mountPath: /etc
+

+#!/bin/bash
+
+# shellcheck disable=SC1091
+
+set -o errexit
+set -o nounset
+set -o pipefail
+# set -o xtrace # Uncomment this line for debugging purposes
+
+# Load libraries
+. /opt/bitnami/scripts/libbitnami.sh
+. /opt/bitnami/scripts/libpostgresql.sh
+
+# Load MySQL environment variables
+. /opt/bitnami/scripts/postgresql-env.sh
+
+print_welcome_page
+
+set -x
+id
+cat /etc/passwd
+ls -la /bitnami/postgresql /bitnami/postgresql/data/ /opt/bitnami/postgresql/
+chown -R $POSTGRESQL_DAEMON_USER:$POSTGRESQL_DAEMON_GROUP /opt/bitnami/postgresql/tmp /opt/bitnami/postgresql/logs
+exec bash -x "$@"

+#!/bin/bash
+
+# shellcheck disable=SC1091
+
+set -o errexit
+set -o nounset
+set -o pipefail
+# set -o xtrace # Uncomment this line for debugging purposes
+
+# Load libraries
+. /opt/bitnami/scripts/libbitnami.sh
+. /opt/bitnami/scripts/libpostgresql.sh
+
+# Load MySQL environment variables
+. /opt/bitnami/scripts/postgresql-env.sh
+
+print_welcome_page
+
+info "** Starting PostgresQL setup **"
+/opt/bitnami/scripts/postgresql/setup.sh
+info "** PostgresQL setup finished! **"
+ls -la /bitnami/postgresql /bitnami/postgresql/data/ /opt/bitnami/postgresql/
+cp -a /etc/* /runtime-etc/
+cat /etc/passwd

+#!/bin/sh
+
+set -e
+
+touch /docker-entrypoint-initdb.d/.restored

+#!/usr/bin/env bash
+
+set -ex
+trap 'exit' TERM
+
+while [[ ! -e $WAIT_FOR_FILE ]]; do
+  echo "Waiting for file: $WAIT_FOR_FILE" 1>&2
+  sleep 1
+  count=5
+  while [[ ! -e $WAIT_FOR_FILE && $count -gt 0 ]]; do
+    count=$(($count - 1))
+    sleep 1
+  done
+done
+

+namePrefix: {{ .Values.namePrefix }}
+namespace: {{ .Values.namespace }}
+images:
+  - name: debian
+    newName: {{ .Values.images.debian }}
+  - name: postgresql
+    newName: {{ .Values.images.postgresql }}
+