refactor(api): always use HOST=0.0.0.0 with docker compose (#56618)

.github/workflows/e2e-with-new-api.yml

@@ -147,7 +147,6 @@ jobs:
       - name: Set freeCodeCamp Environment Variables (needed by api)
         run: |
           cp sample.env .env
-          echo 'HOST=0.0.0.0' >> .env
 
       - name: Install playwright dependencies
         run: npx playwright install --with-deps

docker-compose.yml

@@ -34,5 +34,6 @@ services:
       # container, so we have to override these variables.
       - MONGOHQ_URL=mongodb://mongo:27017/freecodecamp?directConnection=true
       - MAILHOG_HOST=mailhog
+      - HOST=0.0.0.0
     ports:
       - '3000:3000'