Fix .env issue and update docker file

.env.example

@@ -0,0 +1,10 @@
+# Copy this file to .env and update values for local development
+# cp .env.example .env
+
+# Backend
+DATABASE_URL=postgresql+psycopg://postgres:postgres@postgres:5432/zaban_backend_development
+SECRET_KEY=your-local-secret-key
+ALLOWED_HOSTS=localhost,127.0.0.1
+
+# Frontend
+NEXT_PUBLIC_EXTERNAL_API_URL=http://localhost:8000

.gitignore

@@ -1,7 +1,5 @@
 # Environment variables
 .env
-.env.local
-.env.*.local
 
 # Docker
 docker-compose.override.yml

docker-compose.yml

@@ -25,10 +25,10 @@ services:
       context: ./zaban_backend
       dockerfile: Dockerfile
     container_name: zaban-backend
-    env_file:
-      - ./zaban_backend/.env
     environment:
-      DATABASE_URL: ${DATABASE_URL:-postgresql+psycopg://postgres:postgres@postgres:5432/zaban_backend_development}
+      - DATABASE_URL=${DATABASE_URL}
+      - SECRET_KEY=${SECRET_KEY:-}
+      - ALLOWED_HOSTS=${ALLOWED_HOSTS:-}
     ports:
       - "8000:8000"
     depends_on:
@@ -45,11 +45,11 @@ services:
     build:
       context: ./frontend
       dockerfile: Dockerfile
+      args:
+        - NEXT_PUBLIC_EXTERNAL_API_URL=${NEXT_PUBLIC_EXTERNAL_API_URL:-http://localhost:8000}
     container_name: zaban-frontend
-    env_file:
-      - ./frontend/.env
     environment:
-      NEXT_PUBLIC_EXTERNAL_API_URL: ${NEXT_PUBLIC_EXTERNAL_API_URL:-http://localhost:8000}
+      - NEXT_PUBLIC_EXTERNAL_API_URL=${NEXT_PUBLIC_EXTERNAL_API_URL:-http://localhost:8000}
     ports:
       - "3000:3000"
     depends_on:

frontend/.dockerignore

@@ -4,6 +4,8 @@ node_modules
 .gitignore
 README.md
 *.md
+.env
+.env*
 .env*.local
 .vscode
 .idea

frontend/Dockerfile

@@ -18,6 +18,10 @@ COPY --from=deps /app/node_modules ./node_modules
 # Copy application code
 COPY . .
 
+# Build arguments for NEXT_PUBLIC_* variables (must be available at build time)
+ARG NEXT_PUBLIC_EXTERNAL_API_URL
+ENV NEXT_PUBLIC_EXTERNAL_API_URL=${NEXT_PUBLIC_EXTERNAL_API_URL}
+
 # Set build-time environment variables
 ENV NEXT_TELEMETRY_DISABLED=1
 ENV NODE_ENV=production