Allow configurable host port

blueprint.md

@@ -37,7 +37,7 @@ 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
 ```
 
 Minimal Compose using the published image:
@@ -69,7 +69,7 @@ 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: