Migrate Windows CI from Appveyor to GitHub Actions

[rht]

We'd want to have fewer CI platforms to keep track of.
See also https://chat.zulip.org/#narrow/stream/16-desktop/topic/appveyor.20ci.

[ganpa3]

@zulipbot claim

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[ganpa3]

Much of the work is done in this PR:
#901

[rht]

@ganpa3 that PR is for app installer. The test procedure on appveyor.yml is different. You can still work on it.

[rht]

Oh, actually, that PR includes npm run test on windows-latest.

[timabbott]

Sounds like we should rebase/clean up #901, which seems to have been unfinished; I don't think the author has been active recently so someone else should take it up.

[ganpa3]

@zulipbot claim

[zulipbot]

Hello @ganpa3!

Thanks for your interest in Zulip! You have attempted to claim an issue without the labels "help wanted", "good first issue". Since you're a new contributor, you can only claim and submit pull requests for issues with the help wanted or good first issue labels.

If this is your first time here, we recommend reading our guide for new contributors before getting started.

[ganpa3]

@zulipbot add "help wanted"

[ganpa3]

@zulipbot claim

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