Revert "Enable only the package-source-builder docker image"

This reverts commit d285422a.

.gitlab-ci.yml

@@ -107,6 +107,12 @@ build-base-docker-image:
   variables:
     image: base
 
+build-package-builder-docker-image:
+  extends: .build-docker-image
+  stage: derived images
+  variables:
+    image: package-builder
+
 build-package-source-builder-docker-image:
   extends: .build-docker-image
   stage: derived images
@@ -222,6 +228,12 @@ publish-base-docker-image:
   variables:
     image: base
 
+publish-package-builder-docker-image:
+  extends: .publish-docker-image
+  stage: publish images
+  variables:
+    image: package-builder
+
 publish-package-source-builder-docker-image:
   extends: .publish-docker-image
   stage: publish images