Add upload-to-s3 step.

@@ -107,4 +107,19 @@ spec:
         - name: exports
           workspace: exports
 
+    - name: upload-to-s3
+      runAfter:
+        - export
+      taskRef:
+        name: task-s5cmd-upload
+      workspaces:
+        - name: files
+          workspace: exports
+      params:
+        - name: auth-config-map
+          value: $(params.auth-config-map)
+        - name: auth-secret
+          value: $(params.auth-secret)
+        - name: items
+          value: ["$(params.exports[*])"]