Added support for compose env vars (celery#532) (celery#533)

* Added support for compose env vars (celery#532)

Added `.env` to `.gitignore`.

Added a `.env.sample` that will be used by anyone he need it. Just copy
it as `.env` in your local devel env and use the (supported) variables
you need.

`docker-compose.yml` updated in order to support string interpolation
when using variables defined in a `.env` file.

Fixed a typo in `issue_template.md`.

* newline

* newline

Co-authored-by: Asif Saif Uddin <auvipy@gmail.com>

Author: diegocastrum

.env.sample

@@ -0,0 +1,15 @@
+# CELERY
+# -----------------------------------------------------------------------------
+# CELERY_BROKER_URL=amqp://guest:guest@rabbitmq:5672/
+
+# DJANGO
+# -----------------------------------------------------------------------------
+DJANGO_PORT=58000
+DJANGO_HOST=127.0.0.1
+
+# RABBITMQ
+# -----------------------------------------------------------------------------
+# RABBITMQ_HOST=
+# RABBITMQ_PASSWORD=
+RABBITMQ_PORT=5672
+# RABBITMQ_USER=

.gitignore

@@ -33,3 +33,4 @@ coverage.xml
 .eggs/
 .python-version
 venv
+.env

docker-compose.yml

@@ -19,9 +19,9 @@ services:
       context: .
       dockerfile: docker/django/Dockerfile
     ports:
-      - "127.0.0.1:58000:8000"
+      - "${DJANGO_HOST:-127.0.0.1}:${DJANGO_PORT:-58000}:8000"
     entrypoint: ["/app/docker/django/entrypoint.sh"]
-    command: ["python3", "manage.py", "runserver", "0.0.0.0:8000"]
+    command: ["python3", "manage.py", "runserver", "0.0.0.0:${DJANGO_PORT:-8000}"]
     tty: true
     volumes:
       - './django_celery_beat/:/app/django_celery_beat/'
@@ -36,7 +36,7 @@ services:
       dockerfile: docker/celery-beat/Dockerfile
     entrypoint: ["/app/docker/celery-beat/entrypoint.sh"]
     environment:
-        CELERY_BROKER_URL: 'amqp://guest:guest@rabbit:5672'
+        CELERY_BROKER_URL: 'amqp://${RABBITMQ_USER:-guest}:${RABBITMQ_PASSWORD:-guest}@${RABBITMQ_HOST:-rabbit}:${RABBITMQ_PORT:-5672}'
     command: ["python3", '-m', "celery", "-A", "mysite", "beat", "-l", "info", "--scheduler", "django_celery_beat.schedulers:DatabaseScheduler"]
     tty: true
     volumes:
@@ -45,7 +45,7 @@ services:
   rabbit:
     image: rabbitmq
     ports:
-        - "5672:5672"
+        - "${RABBITMQ_PORT:-5672}:5672"
   postgres:
     image: postgres
     environment:

issue_template.md

@@ -1,6 +1,6 @@
 ### Summary:
 
-Include a *brief* descrioption of the problem here, and fill out the version info below.  
+Include a *brief* description of the problem here, and fill out the version info below.  
 
 * Celery Version: 
 * Celery-Beat Version: