add compose file

Author: nanehambardzumyan

Dockerfile

@@ -8,6 +8,6 @@ RUN npm ci
 COPY . .
 RUN npm run build
 
-EXPOSE 8080
+EXPOSE 3000
 
 CMD ["npm", "start"]

README.md

@@ -32,15 +32,21 @@ docker build -t learn_mobile-preview .
 Run it:
 
 ```bash
-docker run --rm -p 8080:8080 learn_mobile-preview
+docker run --rm -p 3000:3000 learn_mobile-preview
 ```
 
-Open `http://localhost:8080`. The phone iframe points at `/__expo_preview/`, which the Vite server proxies to Expo web at `http://localhost:3001` by default. In Docker, that default only works when Expo is reachable from the container as `localhost:3001`.
+Open `http://localhost:3000`. The phone iframe points at `/__expo_preview/`, which the Vite server proxies to Expo web at `http://localhost:3001` by default. In Docker, that default only works when Expo is reachable from the container as `localhost:3001`.
 
 To target a different Expo web URL:
 
 ```bash
-docker run --rm -p 8080:8080 -e EXPO_WEB_URL="http://host.docker.internal:3001" learn_mobile-preview
+docker run --rm -p 3000:3000 -e EXPO_WEB_URL="http://host.docker.internal:3001" learn_mobile-preview
+```
+
+Or use Docker Compose so the port mapping is stored in config:
+
+```bash
+docker compose up
 ```
 
 ## Container Registry

docker-compose.yml

@@ -0,0 +1,7 @@
+services:
+  mobile-preview:
+    image: ghcr.io/codesignal/learn_mobile-preview:latest
+    ports:
+      - "3000:3000"
+    environment:
+      EXPO_WEB_URL: http://host.docker.internal:3001