test: Test Fedora Atomic on all pull requests
test: Test Fedora Atomic on all pull requests

This operating system is sufficently different that it gives us
a good early heads up where a change may break on Atomic but not
on a package based operating system.

Closes #3308
Reviewed-by: Marius Vollmer <bb11c6e942c5cc765df5f04da146b3198127a7a3@redhat.com>

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