Move from CCI to GH CI

[baentsch]

[...] move them over at your leisure.

Originally posted by @ryjones in #1789 (comment)

[ryjones]

@baentsch I set up an ARM64 runner: https://github.com/organizations/open-quantum-safe/settings/actions/runners/557

this is my local Mac. Feel free to start using it (and telling me what doesn't work). This user is not an admin, so colima (docker) may not work.