build: add GH Actions CI #243

I made this change thinking there was no CI in place already, but I noticed the Travis config just now so feel free to reject this. Then again, it might make sense to keep both given Travis' upcoming billing changes.

I made this change thinking there was no CI in place already, but I noticed the Travis config just now so feel free to reject this. Then again, it might make sense to keep both given Travis' [upcoming billing changes](https://blog.travis-ci.com/2020-11-02-travis-ci-new-billing).

Thanks! I had been thinking I needed to migrate away from Travis, but I hadn’t looked into the details.

Thanks! I [had been thinking](https://github.com/mbutterick/pollen-users/issues/75) I needed to migrate away from Travis, but I hadn’t looked into the details.

Can your GH Actions script test Racket 6.3 and later?
Is there any reason for me to keep Travis?

Can your GH Actions script test Racket 6.3 and later? Is there any reason for me to keep Travis?

I think it can currently install Rackets as far back as 6.5, but I should be able to modify it to support 6.4 and 6.3. The installer URL structure is different prior to 6.5 so that's why those versions are not currently supported.

I only went back to 7.4 in my PR because that's as far back as the CS releases go. If you like, I can make a new PR to get it to test on 6.5 and up and have it conditionally test the CS variant for the versions where it's available. If you want to keep supporting 6.3 and 6.4 in CI, I can try to add support for those to setup-racket next weekend.

I don't think there's any reason in particular to keep Travis around.

I think it can currently install Rackets as far back as 6.5, but I should be able to modify it to support 6.4 and 6.3. The installer URL structure is different prior to 6.5 so that's why those versions are not currently supported. I only went back to 7.4 in my PR because that's as far back as the CS releases go. If you like, I can make a new PR to get it to test on 6.5 and up and have it conditionally test the CS variant for the versions where it's available. If you want to keep supporting 6.3 and 6.4 in CI, I can try to add support for those to `setup-racket` next weekend. I don't think there's any reason in particular to keep Travis around.

If 6.5 is the easier target, then I can live with that. I can drop support for 6.3 and 6.4. The price of progress 🤘

Thanks for setup-racket!

Thanks for `setup-racket`!

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build: add GH Actions CI #243

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