Implement GitHub Actions

[paulo-ferraz-oliveira]

You might also want to reference the "build" status in README.md.

I think you need to "activate" GitHub Actions on master after which I can rebase this for testing.

Closes #97.

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Note: I added the 23-branch of OTP to the mix and made latest=23.1.

[paulo-ferraz-oliveira]

Hi. Is this OK for merging? Do you want further changes?

[paulo-ferraz-oliveira]

Ping.

[andreineculau]

Thanks. It was a shit show. Among the highlights:

• erlang containers default to erl as the entrypoint, need to specify bash
• they run on debian 9, which has a "too old" git for the "github actions' checkout action" (what a mouthful!) so one needs to install a newer git via backports
• installing git via backports fails on some old erlang container, disabled manually

one alternative is to drop the erlang containers and use kerl.

another alternative: since github actions installs linuxbrew (homebrew), it is possible to install a specific erlang version via homebrew, but then we need to make a local copy in the repo of the respective homebrew formula e.g. brew install $(pwd)/Formula/erlang-18.3/erlang.rb (it's important to keep the file named erlang.rb!)

I see you've opened at least one other issue offering to port travis to github actions in rebar3_lint. My suggestion is we figure out what's the best course of action in jesse before moving forward.

[paulo-ferraz-oliveira]

Yeah, I had some issues here, also: https://github.com/inaka/elvis/pull/559/files, where Git has to be installed, since the plugin does a shallow clone.

[paulo-ferraz-oliveira]

one alternative is to drop the erlang containers and use kerl.

What are you trying to achieve by not using the container? Do you have any "very specific" behavior that doesn't otherwise work, as-is? I've ported Travis CI to GitHub Actions in many Erlang repo.s already, and have never had any major issues, except that one with elvis whose tests depend on .git.

[paulo-ferraz-oliveira]

There's also this: https://github.com/marketplace/actions/setup-erlang. I don't know if you've seen it.