feat: use official singularity image

This would remove the need to maintain a special dind image.

.gitlab-ci.yml

@@ -418,8 +418,6 @@ jug_xl:nightly:
   stage: deploy
   interruptible: true
   rules:
-    - if: '$CI_PIPELINE_SOURCE == "merge_request_event"'
-      when: on_success
     - if: '$CI_COMMIT_BRANCH == "master"'
       when: on_success
     - when: never
@@ -433,30 +431,19 @@ jug_xl:nightly:
     - singularity pull build/${BUILD_IMAGE}.sif docker://${CI_REGISTRY_IMAGE}/${BUILD_IMAGE}:${INTERNAL_TAG}-${BUILD_TYPE}
   after_script: ""
 
-jug_dev:singularity:
-  parallel:
-    matrix:
-      - BUILD_TYPE:
-        - default
-        - nightly
-        BUILD_IMAGE:
-        - jug_dev
+singularity:
   extends: .singularity
-  needs:
-    - version
-    - jug_dev
-
-jug_xl:singularity:
   parallel:
     matrix:
       - BUILD_TYPE:
         - default
         - nightly
         BUILD_IMAGE:
+        - jug_dev
         - jug_xl
-  extends: .singularity
   needs:
     - version
+    - jug_dev
     - jug_xl:default
     - jug_xl:nightly