People just need a way how to do scratch builds of modules. It means the module builds which would be garbage collected after few days. My ideas how to do that:

• Add --scratch to rpkg module-build command. That would send "scratch": True to MBS.
• Add "scratch" column to builds table and set it according to the module build request handled in views.py.
• Change the ModuleBuild.json() to include scratch record.
• Change the reuse_component code in utils.py to ignore module builds with scratch=True.
• Build the module as usually, but mark all the components built as part of scratch-build with some scratch_module=True extra_option. Note that this does not mean the component should be scratch-builds, they would be normal real build, but just marked with "scratch_module=True` flag.
• InKojiContentGenerator.py, ignore the scratch module builds completely or mark then with scratch_module=True flag too.
• In pdc-updater project, do not set active=True in PDC for modules with scratch=True.
• Optionally, add scratch column to unreleasedvariants in PDC and set it by the pdc-updater.
• Change the producer.py to find all builds with scratch=True and if they are older than certain time, untag all the components from its build.koji_tag and also build.koji_tag + "-build". Also remove these two koji_tags from Koji.