feat(docker/frontend): make backend URL configurable via env

deployment/docker/frontend/.env.example

@@ -14,5 +14,7 @@ FRONTEND_IMAGENAME=Agit8or/Depl0y-frontend
 FRONTEND_IMAGEVERSION=latest
 FRONTEND_ENABLEAUTOMATICUPDATES=true
 FRONTEND_PORT_EXTERNAL=8080
+BACKEND_BASEURL=http://backend:8000
+
 ###END FRONTEND###
 

deployment/docker/frontend/Dockerfile

@@ -8,7 +8,8 @@ ENV APP_VERSION=${APP_VERSION}
 COPY src/frontend/dist /usr/share/nginx/html
 
 # Custom nginx config for SPA routing (serve index.html for unknown routes)
-COPY deployment/docker/frontend/nginx.conf /etc/nginx/conf.d/default.conf
+# Use nginx's built-in template support to env-substitute BACKEND_BASEURL
+COPY deployment/docker/frontend/nginx.conf /etc/nginx/templates/default.conf.template
 
 EXPOSE 80
 

deployment/docker/frontend/docker-compose.yml

@@ -19,6 +19,8 @@ services:
     logging:
       driver: 'local'
     #env_file: '.env'
+    environment:
+      BACKEND_BASEURL: '${BACKEND_BASEURL:-http://backend:8000}'
     networks:
       EXTERNAL:
     ports:

deployment/docker/frontend/nginx.conf

@@ -10,9 +10,9 @@ server {
         try_files $uri /index.html;
     }
 
-    # Backend API - expects a backend service reachable at http://backend:8000
+    # Backend API - configurable via BACKEND_BASEURL (e.g. http://backend:8000)
     location /api {
-        proxy_pass http://backend:8000;
+        proxy_pass $BACKEND_BASEURL;
         proxy_http_version 1.1;
         proxy_set_header Upgrade $http_upgrade;
         proxy_set_header Connection 'upgrade';