feat(ops): add k3s + ArgoCD GitOps pipeline

- Dockerfile: copy web/ and assets/ to runtime stage so ServeDir routes work
- .gitea/workflows/docker-build.yml: build/push image on master push, pin SHA
  tag back into deploy/kustomization.yaml so ArgoCD sees a real manifest change
- deploy/: Kustomize manifests — Namespace, PVC, Deployment (Recreate for
  SQLite), Service, Traefik Ingress at klondike.aleshym.co
- argocd/application.yaml: auto-sync Application watching deploy/ on Gitea

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

deploy/deployment.yaml

@@ -0,0 +1,62 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: solitaire-server
+  namespace: solitaire
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: solitaire-server
+  # SQLite is single-writer; Recreate avoids two pods owning the PVC at once.
+  strategy:
+    type: Recreate
+  template:
+    metadata:
+      labels:
+        app: solitaire-server
+    spec:
+      imagePullSecrets:
+        - name: gitea-registry
+      containers:
+        - name: server
+          image: solitaire-server
+          imagePullPolicy: Always
+          ports:
+            - containerPort: 8080
+          env:
+            - name: DATABASE_URL
+              value: sqlite:///data/sol.db
+            - name: JWT_SECRET
+              valueFrom:
+                secretKeyRef:
+                  name: solitaire-secrets
+                  key: jwt-secret
+            - name: SERVER_PORT
+              value: "8080"
+          volumeMounts:
+            - name: db-data
+              mountPath: /data
+          livenessProbe:
+            httpGet:
+              path: /health
+              port: 8080
+            initialDelaySeconds: 5
+            periodSeconds: 30
+          readinessProbe:
+            httpGet:
+              path: /health
+              port: 8080
+            initialDelaySeconds: 3
+            periodSeconds: 10
+          resources:
+            requests:
+              cpu: 50m
+              memory: 64Mi
+            limits:
+              cpu: 500m
+              memory: 256Mi
+      volumes:
+        - name: db-data
+          persistentVolumeClaim:
+            claimName: solitaire-db

deploy/ingress.yaml

@@ -0,0 +1,27 @@
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: solitaire-server
+  namespace: solitaire
+  annotations:
+    # Remove the next two lines if you are not using cert-manager.
+    cert-manager.io/cluster-issuer: letsencrypt-prod
+    traefik.ingress.kubernetes.io/router.entrypoints: websecure
+spec:
+  ingressClassName: traefik
+  rules:
+    - host: klondike.aleshym.co
+      http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: solitaire-server
+                port:
+                  name: http
+  # Remove the tls block if you are not using cert-manager.
+  tls:
+    - hosts:
+        - klondike.aleshym.co
+      secretName: solitaire-tls

deploy/kustomization.yaml

@@ -0,0 +1,16 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - namespace.yaml
+  - pvc.yaml
+  - deployment.yaml
+  - service.yaml
+  - ingress.yaml
+
+# CI updates this block automatically via `kustomize edit set image`.
+# The image name here matches the `image: solitaire-server` stub in deployment.yaml.
+images:
+  - name: solitaire-server
+    newName: git.aleshym.co/funman300/solitaire-server
+    newTag: latest

deploy/namespace.yaml

@@ -0,0 +1,4 @@
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: solitaire

deploy/pvc.yaml

@@ -0,0 +1,11 @@
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: solitaire-db
+  namespace: solitaire
+spec:
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 1Gi

deploy/service.yaml

@@ -0,0 +1,12 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: solitaire-server
+  namespace: solitaire
+spec:
+  selector:
+    app: solitaire-server
+  ports:
+    - name: http
+      port: 80
+      targetPort: 8080