feat(chart): add extraInitContainers, extraContainers, extraVolumeMounts, extraVolumes support

Add four extension points to the Helm chart deployment template, allowing
users to inject custom init containers, sidecar containers, volume mounts,
and volumes without modifying the chart itself.

- extraInitContainers: runs before the main container
- extraContainers: sidecar containers alongside the main container
- extraVolumeMounts: additional mounts in the main container
- extraVolumes: additional volumes for the pod

Author: chaodu-agent

charts/openab/templates/deployment.yaml

@@ -29,6 +29,10 @@ spec:
       securityContext:
         {{- toYaml . | nindent 8 }}
       {{- end }}
+      {{- with $cfg.extraInitContainers }}
+      initContainers:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
       containers:
         - name: openab
           image: {{ include "openab.agentImage" $d | quote }}
@@ -101,6 +105,12 @@ spec:
             {{- end }}
             - name: tmp
               mountPath: /tmp
+            {{- with $cfg.extraVolumeMounts }}
+            {{- toYaml . | nindent 12 }}
+            {{- end }}
+      {{- with $cfg.extraContainers }}
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
       {{- with $cfg.nodeSelector }}
       nodeSelector:
         {{- toYaml . | nindent 8 }}
@@ -124,5 +134,8 @@ spec:
         {{- end }}
         - name: tmp
           emptyDir: {}
+        {{- with $cfg.extraVolumes }}
+        {{- toYaml . | nindent 8 }}
+        {{- end }}
 {{- end }}
 {{- end }}

charts/openab/values.yaml

@@ -170,3 +170,11 @@ agents:
     nodeSelector: {}
     tolerations: []
     affinity: {}
+    # extraInitContainers adds init containers to the pod (runs before the main container)
+    extraInitContainers: []
+    # extraContainers adds sidecar containers to the pod
+    extraContainers: []
+    # extraVolumeMounts adds additional volume mounts to the main container
+    extraVolumeMounts: []
+    # extraVolumes adds additional volumes to the pod
+    extraVolumes: []