Add Docker Compose deployment

.dockerignore

@@ -0,0 +1,13 @@
+.git
+.gitignore
+node_modules
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+*.log
+.env
+.env.*
+Dockerfile
+compose.yaml
+

Dockerfile

@@ -0,0 +1,17 @@
+FROM node:24-alpine
+
+WORKDIR /app
+
+ENV NODE_ENV=production
+ENV PORT=3000
+
+COPY package.json ./
+COPY index.html styles.css game.js server.js ./
+
+EXPOSE 3000
+
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+  CMD node -e "fetch('http://127.0.0.1:' + (process.env.PORT || 3000) + '/healthz').then(r => process.exit(r.ok ? 0 : 1)).catch(() => process.exit(1))"
+
+CMD ["node", "server.js"]
+

README.md

@@ -11,13 +11,27 @@ A notepad-playable browser game that combines Tic Tac Toe's line-making goal wit
 - First player to make `4 in a row` wins.
 - If the board fills with no winner, the game is a draw.
 
-## Run Multiplayer
+## Run With Docker Compose
+
+```powershell
+docker compose up --build
+```
+
+Then open `http://localhost:3000` in two browser windows. The first two connected players are paired automatically.
+
+Stop it with:
+
+```powershell
+docker compose down
+```
+
+## Run Locally
 
 ```powershell
 npm start
 ```
 
-Then open `http://localhost:3000` in two browser windows. The first two connected players are paired automatically.
+Then open `http://localhost:3000` in two browser windows.
 
 Set a different port with:
 

compose.yaml

@@ -0,0 +1,12 @@
+services:
+  tictactics:
+    build:
+      context: .
+    image: tictactics:local
+    container_name: tictactics
+    restart: unless-stopped
+    environment:
+      PORT: 3000
+    ports:
+      - "3000:3000"
+

package.json

@@ -4,7 +4,7 @@
   "private": true,
   "description": "A notepad-playable capture tic tac toe browser game with simple WebSocket multiplayer.",
   "scripts": {
-    "start": "node server.js"
+    "start": "node server.js",
+    "compose": "docker compose up --build"
   }
 }
-

server.js

@@ -22,6 +22,13 @@ const mimeTypes = {
 
 const server = http.createServer((request, response) => {
   const requestUrl = new URL(request.url, `http://${request.headers.host}`);
+
+  if (requestUrl.pathname === "/healthz") {
+    response.writeHead(200, { "Content-Type": "application/json; charset=utf-8" });
+    response.end(JSON.stringify({ ok: true }));
+    return;
+  }
+
   const pathname = requestUrl.pathname === "/" ? "/index.html" : requestUrl.pathname;
   const filePath = path.normalize(path.join(root, pathname));