Allow configurable host port

README.md

@@ -50,7 +50,7 @@ POSTGRES_USER=watchlink
 POSTGRES_PASSWORD=change-this-database-password
 NEXTAUTH_URL=https://watchlink.example.com
 NEXTAUTH_SECRET=change-this-with-openssl-rand-base64-32
-PORT=3000
+HOST_PORT=6852
 ```
 
 For local testing, use:
@@ -61,7 +61,7 @@ POSTGRES_USER=watchlink
 POSTGRES_PASSWORD=watchlink
 NEXTAUTH_URL=http://localhost:3000
 NEXTAUTH_SECRET=change-me-with-openssl-rand-base64-32
-PORT=3000
+HOST_PORT=3000
 ```
 
 Minimal `docker-compose.yml` using the published Gitea image:
@@ -93,7 +93,7 @@ services:
       NEXTAUTH_SECRET: ${NEXTAUTH_SECRET:-change-me-with-openssl-rand-base64-32}
       PORT: 3000
     ports:
-      - "3000:3000"
+      - "${HOST_PORT:-3000}:3000"
     command: sh -c "npx prisma migrate deploy && node server.js"
 
 volumes:
@@ -106,7 +106,7 @@ Start the stack:
 docker compose up --build
 ```
 
-The Compose stack exposes the web app on `http://localhost:3000` and uses a Postgres volume named `watchlink_postgres-data`.
+The Compose stack exposes the web app on `http://localhost:${HOST_PORT:-3000}` and uses a Postgres volume named `watchlink_postgres-data`. Keep the container `PORT` at `3000`; change `HOST_PORT` when another container already uses port 3000 on the host.
 
 Build and publish the Gitea image: