Update Heroku deployment for Celery and Redis integration

Procfile

@@ -1,2 +1,4 @@
 web: gunicorn config.wsgi:application
 release: python manage.py collectstatic --noinput && python manage.py migrate
+worker: celery -A config.celery_app worker --loglevel=info
+beat: celery -A config.celery_app beat --loglevel=info

app.json

@@ -1,27 +1,47 @@
-  {
-      "environments": {
-          "test": {
-              "scripts": {
-                  "test": "python manage.py test"
-              },
-              "buildpacks": [{
-                      "url": "https://github.com/cyberdelia/heroku-geo-buildpack.git"
-                  },
-                  {
-                      "url": "heroku/python"
-                  }
-              ],
-              "env": {
-                  "DJANGO_SETTINGS_MODULE": {
-                      "value": "config.settings.test"
-                  },
-                  "LD_LIBRARY_PATH": {
-                      "value": "/app/lib"
-                  },
-                  "BUILD_WITH_GEO_LIBRARIES": {
-                      "value": "1"
-                  }
-              }
-          }
-      }
-  }
+{
+    "environments": {
+        "test": {
+            "scripts": {
+                "test": "python manage.py test"
+            },
+            "buildpacks": [
+                {
+                    "url": "https://github.com/cyberdelia/heroku-geo-buildpack.git"
+                },
+                {
+                    "url": "heroku/python"
+                }
+            ],
+            "env": {
+                "DJANGO_SETTINGS_MODULE": {
+                    "value": "config.settings.test"
+                },
+                "LD_LIBRARY_PATH": {
+                    "value": "/app/lib"
+                },
+                "BUILD_WITH_GEO_LIBRARIES": {
+                    "value": "1"
+                }
+            }
+        },
+        "production": {
+            "scripts": {
+                "postdeploy": "python manage.py migrate && python manage.py load_redis_index"
+            },
+            "env": {
+                "DJANGO_SETTINGS_MODULE": {
+                    "value": "config.settings.production"
+                },
+                "DATABASE_URL": {
+                    "value": "${DATABASE_URL}"
+                },
+                "REDIS_URL": {
+                    "value": "${REDIS_URL}"
+                },
+                "CELERY_BROKER_URL": {
+                    "value": "${CELERY_BROKER_URL}"
+                }
+            }
+        }
+    }
+}

docs/local-setup/configuration.rst

@@ -207,3 +207,45 @@ If you get an :code:`ImproperlyConfigured` error regarding the Spatialite librar
 ::
 
   $ sudo apt install libsqlite3-mod-spatialite
+
+Heroku Deployment
+=================
+
+To deploy the backend along with Celery on Heroku, follow these steps:
+
+1. Ensure you have the Heroku CLI installed and are logged in.
+
+2. Create a new Heroku app:
+
+    .. code-block:: bash
+
+        heroku create your-app-name
+
+3. Add the necessary add-ons for PostgreSQL and Redis:
+
+    .. code-block:: bash
+
+        heroku addons:create heroku-postgresql:hobby-dev
+        heroku addons:create heroku-redis:hobby-dev
+
+4. Set the environment variables:
+
+    .. code-block:: bash
+
+        heroku config:set DJANGO_SETTINGS_MODULE=config.settings.production
+        heroku config:set DATABASE_URL=your-database-url
+        heroku config:set REDIS_URL=your-redis-url
+        heroku config:set CELERY_BROKER_URL=your-redis-url
+
+5. Deploy the app:
+
+    .. code-block:: bash
+
+        git push heroku main
+
+6. Run the migrations and load the Redis index:
+
+    .. code-block:: bash
+
+        heroku run python manage.py migrate
+        heroku run python manage.py load_redis_index