only publish gzipped file
force rebuild
Reconcile

[ci skip]
also publish .tar.gz
force rebuild
Reconcile

[ci skip]
un-verbose, actually compress the archive
Merge branch 'master' into only-gz
force rebuild
Reconcile

[ci skip]
Merge pull request #13 from krlmlr/only-gz

Publish .tar.gz instead of uncompressed ISO file