fix: sync extraVolumes and extraVolumeMounts with RHDH defaults

Signed-off-by: Fortune-Ndlovu <fndlovu@redhat.com>

charts/backstage/ci/with-custom-dynamic-pvc-claim-spec-values.yaml

@@ -10,8 +10,12 @@ upstream:
         storageClass: custom-sc
 
   backstage:
-    # Define the ephemeral volume claim template directly
+    extraVolumeMounts:
+      # The initContainer below will install dynamic plugins in this volume mount.
+      - name: dynamic-plugins-root
+        mountPath: /opt/app-root/src/dynamic-plugins-root
     extraVolumes:
+      # -- Ephemeral volume that will contain the dynamic plugins installed by the initContainer below at start.
       - name: dynamic-plugins-root
         ephemeral:
           volumeClaimTemplate:
@@ -20,6 +24,28 @@ upstream:
                 - ReadWriteOnce
               resources:
                 requests:
+                  # -- Size of the volume that will contain the dynamic plugins. It should be large enough to contain all the plugins.
                   storage: 5Gi
-              # This custom-sc storage class is created in the test GH Workflow
-              storageClassName: custom-sc
+      # Volume that will expose the `dynamic-plugins.yaml` file from the `dynamic-plugins` config map.
+      # The `dynamic-plugins` config map is created by the helm chart from the content of the `global.dynamic` field.
+      - name: dynamic-plugins
+        configMap:
+          defaultMode: 420
+          name: '{{ printf "%s-dynamic-plugins" .Release.Name }}'
+          optional: true
+      # Optional volume that allows exposing the `.npmrc` file (through a `dynamic-plugins-npmrc` secret)
+      # to be used when running `npm pack` during the dynamic plugins installation by the initContainer.
+      - name: dynamic-plugins-npmrc
+        secret:
+          defaultMode: 420
+          optional: true
+          secretName: '{{ printf "%s-dynamic-plugins-npmrc" .Release.Name }}'
+      # Optional volume that allows adding a container registry `auth.json` file (through a `dynamic-plugins-registry-auth` secret)
+      # to be used when installing plugins from secure container registries during the dynamic plugins installation by the initContainer.
+      - name: dynamic-plugins-registry-auth
+        secret:
+          defaultMode: 416
+          optional: true
+          secretName: '{{ printf "%s-dynamic-plugins-registry-auth" .Release.Name }}'
+      - name: npmcacache
+        emptyDir: {}