Introduce development-time Celery services (#1257)

* Introduce development-time Celery services

Closes #1225.

* Re-order django and postgres services in production.yml

* Switch local service extension tactics

* Fix celery services inheriting ports from the django's

{{cookiecutter.project_slug}}/compose/django/Dockerfile-dev

@@ -13,6 +13,14 @@ COPY ./compose/django/start-dev.sh /start-dev.sh
 RUN sed -i 's/\r//' /start-dev.sh
 RUN chmod +x /start-dev.sh
 
+COPY ./compose/django/celery/worker/start-dev.sh /start-celeryworker-dev.sh
+RUN sed -i 's/\r//' /start-celeryworker-dev.sh
+RUN chmod +x /start-celeryworker-dev.sh
+
+COPY ./compose/django/celery/beat/start-dev.sh /start-celerybeat-dev.sh
+RUN sed -i 's/\r//' /start-celerybeat-dev.sh
+RUN chmod +x /start-celerybeat-dev.sh
+
 WORKDIR /app
 
 ENTRYPOINT ["/entrypoint.sh"]

{{cookiecutter.project_slug}}/compose/django/celery/beat/start-dev.sh

@@ -0,0 +1,8 @@
+#!/bin/sh
+
+set -o errexit
+set -o nounset
+set -o xtrace
+
+rm -f './celerybeat.pid'
+celery -A {{cookiecutter.project_slug}}.taskapp beat -l INFO

{{cookiecutter.project_slug}}/compose/django/celery/worker/start-dev.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+set -o errexit
+set -o nounset
+set -o xtrace
+
+celery -A {{cookiecutter.project_slug}}.taskapp worker -l INFO

{{cookiecutter.project_slug}}/local.yml

@@ -5,6 +5,22 @@ volumes:
   postgres_backup_dev: {}
 
 services:
+  django: &django
+    build:
+      context: .
+      dockerfile: ./compose/django/Dockerfile-dev
+    depends_on:
+      - postgres{% if cookiecutter.use_mailhog == 'y' %}
+      - mailhog{% endif %}
+    volumes:
+      - .:/app
+    environment:
+      - POSTGRES_USER={{cookiecutter.project_slug}}
+      - USE_DOCKER=yes
+    ports:
+      - "8000:8000"
+    command: /start-dev.sh
+
   postgres:
     build: ./compose/postgres
     volumes:
@@ -12,23 +28,6 @@ services:
       - postgres_backup_dev:/backups
     environment:
       - POSTGRES_USER={{cookiecutter.project_slug}}
-
-  django:
-    build:
-      context: .
-      dockerfile: ./compose/django/Dockerfile-dev
-    command: /start-dev.sh
-    depends_on:
-      - postgres{% if cookiecutter.use_mailhog == 'y' %}
-      - mailhog{% endif %}
-    environment:
-      - POSTGRES_USER={{cookiecutter.project_slug}}
-      - USE_DOCKER=yes
-    volumes:
-      - .:/app
-    ports:
-      - "8000:8000"
-
 {% if cookiecutter.use_pycharm == 'y' %}
   pycharm:
     build:
@@ -41,10 +40,33 @@ services:
     volumes:
       - .:/app
 {% endif %}
-
 {% if cookiecutter.use_mailhog == 'y' %}
   mailhog:
     image: mailhog/mailhog:v1.0.0
     ports:
       - "8025:8025"
 {% endif %}
+{% if cookiecutter.use_celery == 'y' %}
+  redis:
+    image: redis:3.0
+
+  celeryworker:
+    # https://github.com/docker/compose/issues/3220
+    <<: *django
+    depends_on:
+      - redis
+      - postgres{% if cookiecutter.use_mailhog == 'y' %}
+      - mailhog{% endif %}
+    ports: []
+    command: /start-celeryworker-dev.sh
+
+  celerybeat:
+    # https://github.com/docker/compose/issues/3220
+    <<: *django
+    depends_on:
+      - redis
+      - postgres{% if cookiecutter.use_mailhog == 'y' %}
+      - mailhog{% endif %}
+    ports: []
+    command: /start-celerybeat-dev.sh
+{% endif %}

{{cookiecutter.project_slug}}/production.yml

@@ -5,13 +5,6 @@ volumes:
   postgres_backup: {}
 
 services:
-  postgres:
-    build: ./compose/postgres
-    volumes:
-      - postgres_data:/var/lib/postgresql/data
-      - postgres_backup:/backups
-    env_file: .env
-
   django:
     build:
       context: .
@@ -22,6 +15,13 @@ services:
     command: /gunicorn.sh
     env_file: .env
 
+  postgres:
+    build: ./compose/postgres
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+      - postgres_backup:/backups
+    env_file: .env
+
   nginx:
     build: ./compose/nginx
     depends_on: