Ensure that server is started correctly in Docker

Also: ignore files generated during application run which enables a
better development experience in Docker with source mounts like
`docker run -p 8080:80 -v $PWD:/doccano -it doccano`.

.dockerignore

@@ -1,5 +1,7 @@
 *
 !app/
+app/staticfiles/
+app/db.sqlite3
 !data/
 !tests/
 !tools/

.gitignore

@@ -195,4 +195,7 @@ pip-selfcheck.json
 /data/sparql/*
 
 # ignore db to avoid merge conflicts
-*.sqlite3
+*.sqlite3
+
+# ignore django generated static files
+app/staticfiles/

Dockerfile

@@ -11,5 +11,9 @@ WORKDIR /doccano
 
 ENV DEBUG="True"
 ENV SECRET_KEY="change-me-in-production"
+ENV BIND="0.0.0.0:80"
+ENV WORKERS="2"
 
-CMD ["gunicorn", "--bind=0.0.0.0:80", "--workers=2", "--pythonpath=app", "app.wsgi"]
+EXPOSE 80
+
+CMD ["/doccano/tools/run.sh"]

tools/run.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+set -o errexit
+
+if [[ ! -d "app/staticfiles" ]]; then python app/manage.py collectstatic --noinput; fi
+
+python app/manage.py migrate
+gunicorn --bind="${BIND:-127.0.0.1:8000}" --workers="${WORKERS:-1}" --pythonpath=app app.wsgi