add WEB_PORT environment variable to allow configurable web interface port mapping

.env.example

@@ -5,3 +5,6 @@ WEB_PASSWORD=admin
 # You MUST change this for a production deployment!
 # Generate a secure key using: python -c "from cryptography.fernet import Fernet; print(Fernet.generate_key().decode())"
 ENCRYPTION_KEY=CHANGE_ME_TO_A_VALID_FERNET_KEY
+
+# The local port that the web interface will bind to
+WEB_PORT=8814

docker-compose.yml

@@ -5,7 +5,7 @@ services:
     build: .
     container_name: xivlauncher-remote-otp
     ports:
-      - "127.0.0.1:8080:8080"
+      - "127.0.0.1:${WEB_PORT:-8814}:8080"
     volumes:
       - ./data:/app/data
     environment: