Move heroku deployment to Docker

Pipfile

@@ -1,24 +0,0 @@
-[[source]]
-
-url = "https://pypi.python.org/simple"
-verify_ssl = true
-name = "pypi"
-
-
-[requires]
-
-python_version = "3.6"
-
-
-[packages]
-
-"psycopg2-binary" = "*"
-django-heroku = "*"
-gunicorn = "*"
-django-widget-tweaks = "*"
-djangorestframework = "*"
-django-filter = "*"
-dj-database-url = "*"
-whitenoise = "*"
-
-[dev-packages]

Procfile

@@ -1 +0,0 @@
-web: gunicorn --pythonpath app app.wsgi

README.md

@@ -35,6 +35,16 @@ Doccano can be deployed to Azure ([Web App for Containers](https://azure.microso
 
 [![Deploy to Azure](https://azuredeploy.net/deploybutton.svg)](https://portal.azure.com/#create/Microsoft.Template/uri/https%3A%2F%2Fraw.githubusercontent.com%2Fchakki-works%2Fdoccano%2Fmaster%2Fazuredeploy.json)
 
+### Heroku
+
+Doccano can be deployed to [Heroku](https://www.heroku.com/) by following these steps:
+
+```bash
+heroku create
+heroku stack:set container
+git push heroku master
+```
+
 ## Features
 
 * Collaborative annotation

heroku.yml

@@ -0,0 +1,6 @@
+build:
+  docker:
+    web: Dockerfile
+
+run:
+  web: /doccano/tools/run.sh