Build images using buildx plugin and automatically push on main branch

.gitlab/ci/definitions.yml

@@ -1,25 +1,12 @@
-# Run test job always
-.test:
-  stage: test
-  rules:
-    - when: always
-
-# Run build job only on a default branch when triggered manually
-.deploy:
+.build_and_push:
   stage: deploy
+  needs: []
+  script:
+    - ./scripts/lib/custom-docker-build
   rules:
+    - if: $CI_PIPELINE_SOURCE == "merge_request_event"
+      variables:
+        PUSH_CUSTOM_IMAGE: "false"
     - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
-      when: manual
-
-.test_custom:
-  extends: .test
-  script:
-    - ./scripts/custom-docker-build
-  rules:
-    - when: always
-
-.build_and_deploy_custom:
-  extends: .deploy
-  script:
-    - ./scripts/custom-docker-build --label "ci_pipeline_url=$CI_PIPELINE_URL" --label "ci_job_url=$CI_JOB_URL"
-    - ./scripts/custom-docker-push
+      variables:
+        PUSH_CUSTOM_IMAGE: "true"