Add start-test.bat for an isolated Docker test stand

Runs a separate compose project (pgames-test) on port 8090 with its own
.env.test and data-test/, starts Docker Desktop if needed and generates a
sample game to upload. env_file in compose is now overridable via ENV_FILE.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docker-compose.yml

@@ -1,58 +1,58 @@
-services:
-  db:
-    image: postgres:16-alpine
-    restart: unless-stopped
-    environment:
-      POSTGRES_USER: pgames
-      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-pgames}
-      POSTGRES_DB: pgames
-    volumes:
-      - db:/var/lib/postgresql/data
-    healthcheck:
-      test: ["CMD-SHELL", "pg_isready -U pgames"]
-      interval: 5s
-      retries: 20
-
-  backend:
-    build: ./backend
-    restart: unless-stopped
-    env_file: .env
-    environment:
-      DATABASE_URL: postgresql+asyncpg://pgames:${POSTGRES_PASSWORD:-pgames}@db:5432/pgames
-      DATA_DIR: /data
-    volumes:
-      - ${DATA_PATH:-./data}:/data
-    healthcheck:
-      test: ["CMD", "python", "-c", "import urllib.request; urllib.request.urlopen('http://localhost:8000/api/health')"]
-      interval: 5s
-      retries: 30
-    depends_on:
-      db:
-        condition: service_healthy
-
-  worker:
-    build: ./backend
-    restart: unless-stopped
-    command: ["python", "-m", "app.worker"]
-    env_file: .env
-    environment:
-      DATABASE_URL: postgresql+asyncpg://pgames:${POSTGRES_PASSWORD:-pgames}@db:5432/pgames
-      DATA_DIR: /data
-    volumes:
-      - ${DATA_PATH:-./data}:/data
-    depends_on:
-      backend:
-        condition: service_healthy  # migrations are applied by backend
-
-  web:
-    build: ./frontend
-    restart: unless-stopped
-    ports:
-      - "${HTTP_PORT:-8080}:80"
-    volumes:
-      - ${DATA_PATH:-./data}:/data:ro
-    depends_on:
-      - backend
-
-volumes:
-  db:
+services:
+  db:
+    image: postgres:16-alpine
+    restart: unless-stopped
+    environment:
+      POSTGRES_USER: pgames
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-pgames}
+      POSTGRES_DB: pgames
+    volumes:
+      - db:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U pgames"]
+      interval: 5s
+      retries: 20
+
+  backend:
+    build: ./backend
+    restart: unless-stopped
+    env_file: ${ENV_FILE:-.env}
+    environment:
+      DATABASE_URL: postgresql+asyncpg://pgames:${POSTGRES_PASSWORD:-pgames}@db:5432/pgames
+      DATA_DIR: /data
+    volumes:
+      - ${DATA_PATH:-./data}:/data
+    healthcheck:
+      test: ["CMD", "python", "-c", "import urllib.request; urllib.request.urlopen('http://localhost:8000/api/health')"]
+      interval: 5s
+      retries: 30
+    depends_on:
+      db:
+        condition: service_healthy
+
+  worker:
+    build: ./backend
+    restart: unless-stopped
+    command: ["python", "-m", "app.worker"]
+    env_file: ${ENV_FILE:-.env}
+    environment:
+      DATABASE_URL: postgresql+asyncpg://pgames:${POSTGRES_PASSWORD:-pgames}@db:5432/pgames
+      DATA_DIR: /data
+    volumes:
+      - ${DATA_PATH:-./data}:/data
+    depends_on:
+      backend:
+        condition: service_healthy  # migrations are applied by backend
+
+  web:
+    build: ./frontend
+    restart: unless-stopped
+    ports:
+      - "${HTTP_PORT:-8080}:80"
+    volumes:
+      - ${DATA_PATH:-./data}:/data:ro
+    depends_on:
+      - backend
+
+volumes:
+  db: