[releng] Issue #7100: new koji tags for atomic host

ausil added a new comment to an issue you are following: `` The risk of koji-gc has nothing to do with the f27-atomic-overrides tag and everything to do with the signed copies being cleaned up before they are tagged into it. we can work around it by setting up some process to ensure they are signed and have signed copies written out to disk.

pungi builds the installer every time we run it to ensure that we have the correct bits inside of the installer. it has to gather the rpms and make the repos anyway as part of the compose process, you are adding additional overhead ``

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