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/configmap.yaml

@@ -0,0 +1,35 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: {{ include "gitks.fullname" . }}
+  labels:
+    {{- include "gitks.labels" . | nindent 4 }}
+data:
+  RUST_LOG: {{ .Values.gitks.rustLog | quote }}
+  REPO_PREFIX_PATH: {{ .Values.gitks.repoPrefixPath | quote }}
+  GITKS_HOST: {{ .Values.gitks.grpc.host | quote }}
+  GITKS_PORT: {{ .Values.gitks.grpc.port | quote }}
+  GITKS_METRICS_PORT: {{ .Values.gitks.metrics.port | quote }}
+  GITKS_CLUSTER_PORT: {{ .Values.gitks.cluster.port | quote }}
+  GITKS_CLUSTER_COOKIE: {{ .Values.gitks.cluster.cookie | quote }}
+  {{- if .Values.gitks.etcd.endpoints }}
+  GITKS_ETCD_ENDPOINTS: {{ .Values.gitks.etcd.endpoints | quote }}
+  {{- end }}
+  GITKS_ETCD_CONNECT_TIMEOUT: {{ .Values.gitks.etcd.connectTimeout | quote }}
+  GITKS_LEASE_TTL: {{ .Values.gitks.etcd.leaseTtl | quote }}
+  GITKS_HEALTH_CHECK_INTERVAL: {{ .Values.gitks.healthCheck.interval | quote }}
+  GITKS_MAX_HEALTH_FAILURES: {{ .Values.gitks.healthCheck.maxFailures | quote }}
+  GITKS_DISK_CACHE_ENABLED: {{ .Values.gitks.diskCache.enabled | quote }}
+  GITKS_DISK_CACHE_MAX_AGE: {{ .Values.gitks.diskCache.maxAge | quote }}
+  GITKS_PACK_CACHE_ENABLED: {{ .Values.gitks.packCache.enabled | quote }}
+  GITKS_PACK_CACHE_BACKPRESSURE: {{ .Values.gitks.packCache.backpressure | quote }}
+  GITKS_HOOKS_ENABLED: {{ .Values.gitks.hooks.enabled | quote }}
+  GITKS_HOOK_TIMEOUT: {{ .Values.gitks.hooks.timeout | quote }}
+  GITKS_ALLOW_CUSTOM_HOOKS: {{ .Values.gitks.hooks.allowCustomHooks | quote }}
+  {{- if .Values.gitks.hooks.serverHooksDir }}
+  GITKS_SERVER_HOOKS_DIR: {{ .Values.gitks.hooks.serverHooksDir | quote }}
+  {{- end }}
+  {{- if .Values.gitks.hooks.callbackAddr }}
+  GITKS_HOOK_CALLBACK_ADDR: {{ .Values.gitks.hooks.callbackAddr | quote }}
+  {{- end }}
+  GITKS_RATE_LIMIT_MAX_CONCURRENT: {{ .Values.gitks.rateLimit.maxConcurrent | quote }}