Add Helm chart and chart-release workflow

charts/terdut-server/ — Helm chart for Kubernetes deployment:
  - Deployment (replicas=1, /healthz probes, TERDUT_DB_PATH=/data/terdut.db)
  - Service (ClusterIP :8080)
  - PVC (1Gi, synology-iscsi) mounted at /data
  - HTTPRoute via envoy-main gateway

.github/workflows/chart-release.yml — packages and publishes the chart to
gh-pages branch on any push to main that touches charts/; repo URL will be
https://yeniklas.github.io/terdut-server once the repo is made public

charts/terdut-server/.helmignore

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+.DS_Store
+.git/
+.gitignore
+.bzr/
+.bzrignore
+.hg/
+.hgignore
+.svn/
+*.swp
+*.bak
+*.tmp
+*.orig
+*~
+.project
+.idea/
+*.tmproj
+.vscode/

charts/terdut-server/Chart.yaml

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+apiVersion: v2
+name: terdut-server
+description: A Helm chart for Terminal Duty — on-call alert management server
+type: application
+version: 0.1.0
+appVersion: "latest"

charts/terdut-server/templates/_helpers.tpl

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+{{- define "terdut-server.name" -}}
+{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" }}
+{{- end }}
+
+{{- define "terdut-server.fullname" -}}
+{{- if .Values.fullnameOverride }}
+{{- .Values.fullnameOverride | trunc 63 | trimSuffix "-" }}
+{{- else }}
+{{- $name := default .Chart.Name .Values.nameOverride }}
+{{- if contains $name .Release.Name }}
+{{- .Release.Name | trunc 63 | trimSuffix "-" }}
+{{- else }}
+{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" }}
+{{- end }}
+{{- end }}
+{{- end }}
+
+{{- define "terdut-server.chart" -}}
+{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" }}
+{{- end }}
+
+{{- define "terdut-server.labels" -}}
+helm.sh/chart: {{ include "terdut-server.chart" . }}
+{{ include "terdut-server.selectorLabels" . }}
+{{- if .Chart.AppVersion }}
+app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
+{{- end }}
+app.kubernetes.io/managed-by: {{ .Release.Service }}
+{{- end }}
+
+{{- define "terdut-server.selectorLabels" -}}
+app.kubernetes.io/name: {{ include "terdut-server.name" . }}
+app.kubernetes.io/instance: {{ .Release.Name }}
+{{- end }}

charts/terdut-server/templates/deployment.yaml

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+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: {{ include "terdut-server.fullname" . }}
+  labels:
+    {{- include "terdut-server.labels" . | nindent 4 }}
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      {{- include "terdut-server.selectorLabels" . | nindent 6 }}
+  template:
+    metadata:
+      labels:
+        {{- include "terdut-server.selectorLabels" . | nindent 8 }}
+    spec:
+      enableServiceLinks: false
+      containers:
+        - name: terdut-server
+          image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
+          imagePullPolicy: {{ .Values.image.pullPolicy }}
+          ports:
+            - name: http
+              containerPort: {{ .Values.service.port }}
+              protocol: TCP
+          env:
+            - name: TERDUT_ADDR
+              value: ":{{ .Values.service.port }}"
+            - name: TERDUT_DB_PATH
+              value: "/data/terdut.db"
+          volumeMounts:
+            - name: data
+              mountPath: /data
+          livenessProbe:
+            httpGet:
+              path: /healthz
+              port: http
+            initialDelaySeconds: 5
+          readinessProbe:
+            httpGet:
+              path: /healthz
+              port: http
+            initialDelaySeconds: 5
+      volumes:
+        - name: data
+          persistentVolumeClaim:
+            claimName: {{ .Release.Name }}-data

charts/terdut-server/templates/httpproxy.yaml

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+---
+apiVersion: gateway.networking.k8s.io/v1
+kind: HTTPRoute
+metadata:
+  name: {{ .Release.Name }}
+spec:
+  hostnames:
+  - {{ .Values.networking.hostname | quote }}
+  parentRefs:
+  - name: envoy-main
+    namespace: envoy-gateway-system
+  rules:
+  - backendRefs:
+    - name: {{ include "terdut-server.fullname" . }}
+      port: {{ .Values.networking.servicePort }}

charts/terdut-server/templates/pvc.yaml

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+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: {{ .Release.Name }}-data
+  namespace: {{ .Release.Namespace }}
+spec:
+  storageClassName: {{ .Values.storage.storageClass | quote }}
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: {{ .Values.storage.size }}

charts/terdut-server/templates/service.yaml

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+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ include "terdut-server.fullname" . }}
+  labels:
+    {{- include "terdut-server.labels" . | nindent 4 }}
+spec:
+  type: {{ .Values.service.type }}
+  ports:
+    - port: {{ .Values.service.port }}
+      targetPort: http
+      protocol: TCP
+      name: http
+  selector:
+    {{- include "terdut-server.selectorLabels" . | nindent 4 }}

charts/terdut-server/values.yaml

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+networking:
+  hostname: "terdut.example.com"
+  servicePort: 8080
+
+image:
+  repository: ghcr.io/yeniklas/terdut-server
+  tag: "latest"
+  pullPolicy: IfNotPresent
+
+storage:
+  size: 1Gi
+  storageClass: synology-iscsi
+
+service:
+  type: ClusterIP
+  port: 8080