idhub.entrypoint: makemigrations not needed

supposedly you should have all the migrations from the source code or
git repository

docker/idhub.entrypoint.sh

@@ -29,7 +29,6 @@ deployment_strategy() {
         # detect if existing deployment (TODO only works with sqlite)
         if [ -f "${idhub_dir}/db.sqlite3" ]; then
                 echo "INFO: detected EXISTING deployment"
-                ./manage.py makemigrations
                 ./manage.py migrate
 
                 # warn admin that it should re-enter password to keep the service working