Add helm plugins before running helmfile.

@@ -33,10 +33,19 @@ data:
   check-mode: |
     #!/bin/sh
     set -ex
-    if [ $(cat /tmp/git-storage/repo-type) = $1 ]; then
+    wanted_type="$1"
+    if [ $(cat /tmp/git-storage/repo-type) = $wanted_type ]; then
       shift
-      "$@"
+      /tmp/k8s-bootstrap-scripts/run-$wanted_type "$@"
     fi
+  run-helmfile: |
+    #!/bin/sh
+    set -ex
+    helm plugin install https://github.com/mumoshu/helm-x
+    helm plugin install https://github.com/databus23/helm-diff
+    helm plugin install https://github.com/aslafy-z/helm-git.git
+    "$@"
+
 ---
 apiVersion: batch/v1
 kind: Job