Add a postgres database container.

- Set environemnt variables for Postgresql database in the compose file
- Set environment variables for uwsgi in the compose file
- Check if the postgresql container is up and accepting connections before
  running any actual services.

web/assets/run.sh

@@ -0,0 +1,31 @@
+#! /bin/bash
+set -e
+
+# Check if the database is available yet. Do not start the container before the
+# postgresql boots up.
+until psql $DATABASE_URL -c '\l'; do
+  >&2 echo "Postgres is unavailable - sleeping"
+  sleep 1
+done
+
+>&2 echo "Postgres is up - continuing"
+
+# Check if the settings file is available and can be imported.
+
+
+# Check if we are in the correct directory before running commands.
+if [[ ! $(pwd) == '/opt/mailman-web' ]]; then
+	echo "Running in the wrong directory...switching to /opt/mailman-web"
+	cd /opt/mailman-web
+fi
+
+
+# Collect static for the django installation.
+python manage.py collectstatic --noinput
+
+# Migrate all the data to the database if this is a new installation, otherwise
+# this command will upgrade the database.
+python manage.py migrate
+
+# Run the web server.
+uwsgi --http-auto-chunked --http-keepalive