fix: use env_file to properly inject all .env vars into containers

docker-compose.yml

@@ -17,28 +17,17 @@ services:
   web:
     build: .
     restart: unless-stopped
+    env_file: .env
     ports:
       - "${APP_PORT:-8000}:8000"
     depends_on:
       db:
         condition: service_healthy
     environment:
-      SECRET_KEY: ${SECRET_KEY}
-      DEBUG: ${DEBUG:-False}
-      ALLOWED_HOSTS: ${ALLOWED_HOSTS:-localhost}
-      CSRF_TRUSTED_ORIGINS: ${CSRF_TRUSTED_ORIGINS:-}
-      SQL_ENGINE: django.db.backends.postgresql
-      SQL_DATABASE: ${SQL_DATABASE:-busmanager}
-      SQL_USER: ${SQL_USER:-busmanager}
-      SQL_PASSWORD: ${SQL_PASSWORD}
       SQL_HOST: db
       SQL_PORT: 5432
       STATIC_ROOT: /app/staticfiles
-      EMAIL_HOST: ${EMAIL_HOST:-}
+
-      EMAIL_PORT: ${EMAIL_PORT:-25}
-      # Optional: Telstra SMS
-      TELSTRA_CLIENT_ID: ${TELSTRA_CLIENT_ID:-}
-      TELSTRA_CLIENT_SECRET: ${TELSTRA_CLIENT_SECRET:-}
     volumes:
       - static_files:/app/staticfiles
 
@@ -46,6 +35,7 @@ services:
   cron:
     build: .
     restart: unless-stopped
+    env_file: .env
     entrypoint: >
       sh -c "echo '0 6 * * * python /app/manage.py nightly_check_active_status >> /proc/1/fd/1 2>&1'
       | crontab - && crond -f -d 8"
@@ -53,20 +43,8 @@ services:
       db:
         condition: service_healthy
     environment:
-      SECRET_KEY: ${SECRET_KEY}
-      DEBUG: ${DEBUG:-False}
-      ALLOWED_HOSTS: ${ALLOWED_HOSTS:-localhost}
-      CSRF_TRUSTED_ORIGINS: ${CSRF_TRUSTED_ORIGINS:-}
-      SQL_ENGINE: django.db.backends.postgresql
-      SQL_DATABASE: ${SQL_DATABASE:-busmanager}
-      SQL_USER: ${SQL_USER:-busmanager}
-      SQL_PASSWORD: ${SQL_PASSWORD}
       SQL_HOST: db
       SQL_PORT: 5432
-      EMAIL_HOST: ${EMAIL_HOST:-}
-      EMAIL_PORT: ${EMAIL_PORT:-25}
-      TELSTRA_CLIENT_ID: ${TELSTRA_CLIENT_ID:-}
-      TELSTRA_CLIENT_SECRET: ${TELSTRA_CLIENT_SECRET:-}
 
 volumes:
   postgres_data: