Changed CI to not automatically deploy prod develop.

It is now only deployed if there is also a variable NIGHTLY set. With this we build and deploy on a nightly schedule instead of each merge to develop.

.gitlab-ci.yml

@@ -361,7 +361,7 @@ deploy prod develop:
     - docker run -t -e NOMAD_KEYCLOAK_REALM_NAME=fairdi_nomad_prod ${CI_REGISTRY_IMAGE}/dev_python:${DOCKER_TAG}
       nomad client -n https://nomad-lab.eu/prod/v1/develop/api -u test -w $CI_NOMAD_TEST_PASSWORD integrationtests --skip-publish --skip-doi
   rules:
-    - if: $CI_COMMIT_BRANCH == "develop"
+    - if: $CI_COMMIT_BRANCH == "develop" && $NIGHTLY
     - when: manual
       allow_failure: true