📦 build: Add devcontainer for local Kubernetes development

.devcontainer/docker-compose.yml

@@ -0,0 +1,55 @@
+name: "minikura-devcontainer"
+services:
+  devcontainer:
+    tty: true
+    privileged: true
+    cgroup: host
+    build:
+      context: .
+      dockerfile: Dockerfile
+      args:
+        HOST_UID: ${HOST_UID:-1000}
+        HOST_GID: ${HOST_GID:-1000}
+    tmpfs:
+      - /var/lib/docker:mode=0777,dev,size=15g,suid,exec
+      - /var/lib/rancher:mode=0777,dev,size=15g,suid,exec
+      - /run
+    ports:
+      - "3000:3000"   # backend API
+      - "3001:3001"   # web frontend
+      - "6443:6443"   # k3s API
+      - "25565:25565" # minecraft
+      - "25577:25577" # velocity
+    volumes:
+      - "../:/workspace"
+      - "/sys/fs/cgroup:/sys/fs/cgroup:rw"
+    working_dir: "/workspace"
+    depends_on:
+      db:
+        condition: service_healthy
+    environment:
+      - KUBECONFIG=/home/dev/.kube/config
+      - DATABASE_URL=postgresql://postgres:postgres@db:5432/minikura?sslmode=disable
+      - KUBERNETES_NAMESPACE=minikura
+      - KUBERNETES_SKIP_TLS_VERIFY=true
+      - ENABLE_CRD_REFLECTION=true
+
+  db:
+    image: postgres:17
+    restart: unless-stopped
+    environment:
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: postgres
+      POSTGRES_DB: minikura
+    volumes:
+      - postgres-data:/var/lib/postgresql/data
+    ports:
+      - "5433:5432"
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U postgres"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+
+volumes:
+  postgres-data: