Switch releases to Github CI

.cirrus.yml

.github/ghc-8.10.3-linux.alpine.files

.github/ghc-8.10.3-linux.files

.github/ghc-8.10.3-windows.files

.github/ghcup-run.files

.github/ghcup-run.files.alpine

.github/ghcup-run.files.windows

.github/scripts/bootstrap.sh

.github/scripts/build.sh

.github/scripts/hls.sh

.github/scripts/prereq.sh

.github/scripts/test.sh

.github/workflows/bootstrap.yaml

.github/workflows/hlint.yaml

.github/workflows/mkdocs.yaml

.github/workflows/release.yaml

.github/workflows/shellcheck.yaml

cabal.project

data/metadata

ghcup.cabal