feat(charts): add Helm chart for gitks Git bare repository service

- Create Chart.yaml with application metadata and keywords
- Add _helpers.tpl with name, fullname, labels, and DNS template functions
- Generate ConfigMap with all gitks configuration environment variables
- Implement StatefulSet with persistent volume claims for repository data
- Create headless service for pod DNS and cluster communication
- Add gRPC service for client connections and metrics service
- Include HorizontalPodAutoscaler for dynamic scaling
- Add PodDisruptionBudget to maintain cluster availability
- Create ServiceAccount with proper security context
- Add test connection pod using grpcurl for health checks
- Generate NOTES.txt with installation instructions and quick start guide
- Create .helmignore file to exclude common development files
- Configure persistence, resource limits, and security settings
- Add support for cluster mode with etcd service discovery

charts/templates/tests/test-connection.yaml

@@ -0,0 +1,21 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  name: "{{ include "gitks.fullname" . }}-test-connection"
+  labels:
+    {{- include "gitks.labels" . | nindent 4 }}
+  annotations:
+    "helm.sh/hook": test
+    "helm.sh/hook-delete-policy": before-hook-creation,hook-succeeded
+spec:
+  containers:
+    - name: grpc-health
+      image: fullstorydev/grpcurl:latest
+      command: ['grpcurl']
+      args:
+        - -plaintext
+        - -connect-timeout
+        - "5"
+        - {{ include "gitks.fullname" . }}:{{ .Values.service.port }}
+        - list
+  restartPolicy: Never