standalone-server: add Compose file with local Yjs + Kroki

standalone-server/README.md

@@ -47,7 +47,7 @@ java -jar build/libs/standalone-server-0.1-SNAPSHOT-all.jar
 
 You can download the latest `-all.jar` directly from [Github Packages](https://github.com/epsilonlabs/playground-backend/packages/2333178).
 
-## Running from the Docker image
+## Running from Docker
 
 To run the standalone Playground server directly from Docker, run:
 
@@ -65,4 +65,18 @@ docker run --rm -v ./shorturl:/var/share/shorturl -p 8080:8080 ghcr.io/epsilonla
 ```
 
 Besides the `latest` tag, other tags are supported.
-See [the full list](https://github.com/epsilonlabs/playground-backend/pkgs/container/playground-backend%2Fstandalone-server).
+See [the full list](https://github.com/epsilonlabs/playground-backend/pkgs/container/playground-backend%2Fstandalone-server).
+
+## Running from Docker Compose
+
+This project includes a Docker Compose [`compose.yml`](./compose.yml) file which will start a local copy of the playground, as well as local instances of Yjs and Kroki, and keep "Share" files in a named Docker volume.
+
+To use it, run this command from this directory:
+
+```bash
+docker compose up -d
+```
+
+After some time, the local playground will be accessible from:
+
+http://localhost:8080

standalone-server/compose.yml

@@ -0,0 +1,30 @@
+services:
+  playground:
+    image: ghcr.io/epsilonlabs/playground-backend/standalone-server:latest
+    ports:
+      - 8080:8080
+    volumes:
+      - shorturl:/var/share/shorturl
+    depends_on:
+      - kroki
+      - yjs
+    environment:
+      - PLAYGROUND_YJS_URL=ws://localhost:8082/ws/
+      - PLAYGROUND_KROKI_URL=http://localhost:8081
+  kroki:
+    image: yuzutech/kroki:latest
+    ports:
+      - 8081:8000
+  yjs:
+    image: ghcr.io/epsilonlabs/yjs-websocket-nginx:latest
+    platform: linux/amd64
+    ports:
+      - 8082:80
+    healthcheck:
+      test: curl --fail http://localhost || kill 1
+      interval: 1m30s
+      timeout: 30s
+      start_period: 30s
+    restart: always
+volumes:
+  shorturl: