fix: display missing django migrations

  script:

    - STATE="$(python manage.py makemigrations --dry-run)"

    - |

      if [ ! "$STATE" = "No changes detected" ]; then

        echo "[!] You have model changes for which no migrations have been created."

      if [ ! "${STATE}" = "No changes detected" ]; then

        echo "[!] You have model changes for which no migrations have been created:"

        echo "${STATE}"

        exit 1

      fi