Use docker extensions for env variables

docker-compose.yml

@@ -6,8 +6,22 @@ volumes:
   postgres-data:
   static-files:
 
+x-db-env: &db-env
+  POSTGRES_HOST:
+  POSTGRES_PORT:
+  POSTGRES_DB:
+  POSTGRES_USER:
+  POSTGRES_PASSWORD:
+
+x-django-env: &django-env
+  <<: *db-env
+  DJANGO_SECRET_KEY:
+  DJANGO_SETTINGS_MODULE:
+
 services:
   db:
+    environment:
+      <<: *db-env
     image: postgres:15
     healthcheck:
       # Note that --env-file should be used to set these correctly
@@ -33,13 +47,9 @@ services:
       dockerfile: ./docker/django
       target: production
       args:
-        POSTGRES_HOST:
-        POSTGRES_PORT:
-        POSTGRES_DB:
-        POSTGRES_USER:
-        POSTGRES_PASSWORD:
-        DJANGO_SECRET_KEY:
-        DJANGO_SETTINGS_MODULE:
+        <<: *django-env
+    environment:
+      <<: *django-env
     command: |
       celery worker -n worker1@%h
       -n worker2@%h
@@ -67,13 +77,9 @@ services:
       dockerfile: ./docker/django
       target: production
       args:
-        POSTGRES_HOST:
-        POSTGRES_PORT:
-        POSTGRES_DB:
-        POSTGRES_USER:
-        POSTGRES_PASSWORD:
-        DJANGO_SECRET_KEY:
-        DJANGO_SETTINGS_MODULE:
+        <<: *django-env
+    environment:
+        <<: *django-env
     entrypoint: /app/bin/docker-entrypoint.sh
     command: |
       gunicorn --bind 0.0.0.0:8000