Add GitHub Actions-based CI

[alyst]

No description provided.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@5aae7b0). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff            @@
##             master     #36   +/-   ##
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  Coverage          ?   5.12%           
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  Files             ?       1           
  Lines             ?      39           
  Branches          ?       0           
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  Hits              ?       2           
  Misses            ?      37           
  Partials          ?       0           

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[quinnj]

I don't think the docs/Manifest.toml should be included; otherwise, thanks for doing this!

[alyst]

I don't think the docs/Manifest.toml should be included

Ah, of course. Done