(bugfix) Fix hosts file configuration by using extra_hosts at runtime

Docker overwrites /etc/hosts at container runtime, so copying it during
build (COPY command) or mounting it as volume doesn't work reliably.
Moved to extra_hosts in docker-compose files for both standalone and
swarm deployments.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

docker-stack/docker-compose-standalone.yaml

@@ -17,6 +17,11 @@ services:
     networks:
       - traefik-network
       - util-bills-mongo-network
+    # NextJS will do name resolution for `rezije.app` and will crash if it
+    # resolves to an IP adress different from the one assigned to the Docker container.
+    # This will prevent that from happening.
+    extra_hosts: 
+      - "rezije.app:0.0.0.0"
     environment:
       MONGODB_URI: mongodb://rezije.app:w4z4piJBgCdAm4tpawqB@mongo:27017/utility-bills
       GOOGLE_ID: 355397364527-adjrokm6hromcaaar0qfhk050mfr35ou.apps.googleusercontent.com

docker-stack/docker-compose-swarm.yml

@@ -17,8 +17,11 @@ services:
     networks:
       - traefik-network
       - util-bills-mongo-network
-    volumes:
+    # NextJS will do name resolution for `rezije.app` and will crash if it
-      - ./web-app/etc/hosts/:/etc/hosts
+    # resolves to an IP adress different from the one assigned to the Docker container.
+    # This will prevent that from happening.
+    extra_hosts:
+      - "rezije.app:0.0.0.0"
     environment:
       MONGODB_URI: mongodb://rezije.app:w4z4piJBgCdAm4tpawqB@mongo:27017/utility-bills
       GOOGLE_ID: 355397364527-adjrokm6hromcaaar0qfhk050mfr35ou.apps.googleusercontent.com

web-app/Dockerfile

@@ -38,9 +38,6 @@ COPY --from=builder /app/public/* /app/public/
 # this file is required for the pdfjs-dist package
 COPY --from=builder /app/node_modules/pdfjs-dist/build/pdf.worker.min.mjs /app/public/pdf.worker.min.mjs
 
-# copy custom hosts file to avoid issues with some auth providers
-COPY ./etc/hosts /etc/hosts
-
 # Automatically leverage output traces to reduce image size
 # https://nextjs.org/docs/advanced-features/output-file-tracing
 COPY --from=builder --chown=nonroot:nonroot /app/.next/standalone ./

web-app/etc/hosts

@@ -1,10 +0,0 @@
-127.0.0.1	localhost
-::1	localhost ip6-localhost ip6-loopback
-fe00::0	ip6-localnet
-ff00::0	ip6-mcastprefix
-ff02::1	ip6-allnodes
-ff02::2	ip6-allrouters
-# NextJS will do name resolution for `rezije.app` and will crash if it
-# resolves to an IP adress different from the one assigned to the Docker container.
-# This will prevent that from happening.
-0.0.0.0 rezije.app