CNG: CI overwrites release tags on feature branches
When a feature branch is pushed (e.g. for PostgreSQL CNG image) the CI overwrites the production release tag with the image that is built for the branch. This is particularly dangerous when the feature branch contains any breaking change.
To avoid this,
BUILDING_IMAGE variable must be set to
ci_files/variables.yml. The value needs to be changed after merging the branch which requires another change.