ci: Present docker jobs available only if based on a protected reference

Regarding jobs:
- deploy_docker_test_image
- deploy_docker_release_sha
it doesn’t make sense to have these jobs available since
it will fail with DockerHub password missing since it’s not
running on a protected branch or tag

Brought some difficulty https://forum.duniter.org/t//10164/17

https://stackoverflow.com/questions/54901151/how-do-i-configure-gitlab-ci-jobs-to-run-on-protected-branches-only

.gitlab-ci.yml

@@ -231,6 +231,8 @@ tests_release:
 deploy_docker_test_image:
   extends: .docker-build-app-image
   rules:
+    - if: $CI_COMMIT_REF_PROTECTED == "false"
+      when: never
     - if: $CI_COMMIT_REF_NAME =~ /^wip*$/
       when: manual
     - if: '$CI_COMMIT_TAG || $CI_COMMIT_BRANCH == "master"'
@@ -261,6 +263,8 @@ deploy_docker_debug_sha:
 deploy_docker_release_sha:
   extends: .docker-build-app-image
   rules:
+    - if: $CI_COMMIT_REF_PROTECTED == "false"
+      when: never
     - if: $CI_COMMIT_TAG
       when: never
     - when: manual
@@ -305,4 +309,3 @@ readme_docker_release_tag:
     PUSHRM_DEBUG: 1
     PUSHRM_FILE: "$CI_PROJECT_DIR/docker/README.md"
   script: "/bin/true"
-