Remove apt (ppa:hvr) fallback install method
This PR replicates haskell/actions#138 by Bodigrim.
For recent Ubuntu (> 20.04) the PPA hvr does not provide any GHC
releases, so this install method is now dead.
What's Changed
- Remove apt (ppa:hvr) fallback install method by @andreasabel in #121
Full Changelog: v2.7...v2.8.0
Contributors
andreasabel