use python alpine base image

entrypoint.sh

@@ -1,7 +1,7 @@
-#!/usr/bin/env bash
+#!/usr/bin/env sh
 set -e
 
-if [ "$DJANGO_PRODUCTION_MODE" == "true" ]; then
+if [ "$DJANGO_PRODUCTION_MODE" = "true" ]; then
   echo "starting production server ..."
   gunicorn --bind=0.0.0.0:8000 --workers=2 gaehsnitzproject.wsgi