Add init containers support to Helm chart (#1826)

This commit adds support for init containers in the descheduler Helm chart,
allowing users to run initialization tasks before the main descheduler
container starts.

Changes:
- Add initContainers field to values.yaml with example usage
- Update deployment.yaml template to render init containers
- Update cronjob.yaml template to render init containers
- Bump chart version from 0.34.0 to 0.34.1

Init containers can be used for various purposes such as:
- Pre-loading configuration from external sources
- Waiting for dependencies to be ready
- Setting up required files or permissions
- Running security scans or compliance checks

Example usage in values.yaml:
initContainers:
  - name: init-config
    image: busybox:1.28
    command: ['sh', '-c', 'echo Initializing && sleep 5']

Signed-off-by: kjoshi <kjoshi@egnyte.com>

charts/descheduler/templates/cronjob.yaml

@@ -96,6 +96,10 @@ spec:
           imagePullSecrets:
           {{- toYaml . | nindent 10 }}
           {{- end }}
+          {{- with .Values.initContainers }}
+          initContainers:
+            {{- toYaml . | nindent 12 }}
+          {{- end }}
           containers:
             - name: {{ .Chart.Name }}
               image: "{{ .Values.image.repository }}:{{ .Values.image.tag | default (printf "v%s" .Chart.AppVersion) }}"

charts/descheduler/templates/deployment.yaml

@@ -49,6 +49,10 @@ spec:
       imagePullSecrets:
       {{- toYaml . | nindent 6 }}
       {{- end }}
+      {{- with .Values.initContainers }}
+      initContainers:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
       containers:
         - name: {{ .Chart.Name }}
           image: "{{ .Values.image.repository }}:{{ .Values.image.tag | default (printf "v%s" .Chart.AppVersion) }}"

charts/descheduler/values.yaml

@@ -233,6 +233,13 @@ livenessProbe:
   periodSeconds: 20
   timeoutSeconds: 5
 
+# Init containers to run before the main descheduler container
+initContainers: []
+# Example:
+# - name: init-myservice
+#   image: busybox:1.28
+#   command: ['sh', '-c', 'echo The app is running! && sleep 10']
+
 service:
   enabled: false
   # @param service.ipFamilyPolicy [string], support SingleStack, PreferDualStack and RequireDualStack