Allow configuring additional containers in Helm chart (#167)

* Add extraContainers option for controllerplugin and nodeplugin
* Add extraInitContainers option for controllerplugin and nodeplugin

---------

Signed-off-by: Steven I. <commits@imsteven.xyz>

Author: imstevenxyz

deployments/helm/cvmfs-csi/templates/controllerplugin-deployment.yaml

@@ -19,6 +19,12 @@ spec:
       securityContext: {{ toYaml . | nindent 8 }}
       {{- end }}
       serviceAccountName: {{ include "cvmfs-csi.serviceAccountName.controllerplugin" . }}
+      {{- if .Values.controllerplugin.extraInitContainers }}
+      initContainers:
+        {{- with .Values.controllerplugin.extraInitContainers }}
+        {{- toYaml . | nindent 8 }}
+        {{- end }}
+      {{- end }}
       containers:
         - name: provisioner
           image: {{ .Values.controllerplugin.provisioner.image.repository }}:{{ .Values.controllerplugin.provisioner.image.tag }}
@@ -57,6 +63,9 @@ spec:
           {{- with .Values.controllerplugin.plugin.resources }}
           resources: {{ toYaml . | nindent 12 }}
           {{- end }}
+        {{- with .Values.controllerplugin.extraContainers }}
+        {{- toYaml . | nindent 8 }}
+        {{- end }}
       volumes:
         - name: socket-dir
           emptyDir: {}

deployments/helm/cvmfs-csi/templates/nodeplugin-daemonset.yaml

@@ -24,6 +24,12 @@ spec:
       {{- if .Values.nodeplugin.serviceAccount.use }}
       serviceAccountName: {{ include "cvmfs-csi.serviceAccountName.nodeplugin" . }}
       {{- end }}
+      {{- if .Values.nodeplugin.extraInitContainers }}
+      initContainers:
+        {{- with .Values.nodeplugin.extraInitContainers }}
+        {{- toYaml . | nindent 8 }}
+        {{- end }}
+      {{- end }}
       containers:
         - name: registrar
           image: {{ .Values.nodeplugin.registrar.image.repository }}:{{ .Values.nodeplugin.registrar.image.tag }}
@@ -212,6 +218,9 @@ spec:
               readOnly: true
         {{- end }}
         {{- end }}
+        {{- with .Values.nodeplugin.extraContainers }}
+        {{- toYaml . | nindent 8 }}
+        {{- end }}
       volumes:
         - name: socket-dir
           hostPath:

deployments/helm/cvmfs-csi/values.yaml

@@ -84,6 +84,12 @@ nodeplugin:
       configMap:
         name: cvmfs-csi-default-d
 
+  # Extra containers to be appended to nodeplugin's Pod.spec.containers.
+  extraContainers: []
+
+  # Extra containers to be appended to nodeplugin's Pod.spec.initContainers.
+  extraInitContainers: []
+
   # CVMFS CSI image and container resources specs.
   plugin:
     image:
@@ -256,6 +262,12 @@ controllerplugin:
 
   extraVolumes: []
 
+  # Extra containers to be appended to controllerPlugin's Pod.spec.containers.
+  extraContainers: []
+
+  # Extra containers to be appended to controllerPlugin's Pod.spec.initContainers.
+  extraInitContainers: []
+
   # CVMFS CSI image and container resources specs.
   plugin:
     image: