Nearly completely replace the original GitHub actions workflow.
Changes:

- Move from `.sh` files in `ci/steps` to steps in the workflow.
- Move from using docker images for environment to manual setup.
- Upgrade nfpm to v2.3.1

BREAKING CHANGE: official arm64 builds no longer support CentOS 7.
If you need to use CentOS 7 on arm64, build `code-server` locally.
For docs, see the yarn/npm section in `docs/install.md`.

See also: #2771

I think at some point this script created the release and attached
assets but that's not the case anymore.

For some reason this would error with undefined variable reference for
joe but bash doesn't complain for me or Asher.

Not sure what the difference is.

🎅🏼

Closes #1652
Closes #2221

We do not try renaming $HOME anymore as there is no good way
to do it.

We also only try to convert if the user hasn't been changed.

Finally I added usage to the docker docs in install.md

Closes #2056

systemd's user units are buggy on certain versions
and do not linger by default.

Closes #1771
Closes #1673
Closes #1882
Closes #1861

I'm surprised no one has asked any questions about this.

More clear as discussed in PR.