Move from TavisCI to GitHub Actions

[eps1lon]

Example run: https://github.com/eps1lon/react-transition-group/runs/4298012167?check_suite_focus=true

[koba04]

@eps1lon Thank you for your work, this is great👍
To move CI from TravisCI to GitHub Actions, we also have to migrate semantic-release, so we need @jquense's help.

[koba04]

The current active LTS version of Node is 16, so v16 seems to be better.

https://nodejs.org/en/

Suggested change

	- name: Use Node.js 14
	uses: actions/setup-node@v2
	with:
	node-version: 14
	- name: Use Node.js 16
	uses: actions/setup-node@v2
	with:
	node-version: 16

[eps1lon]

The goal of this PR was to move from Travis to GitHub actions. Travis was running on node 14. I think we should do this in a follow-up.

[koba04]

I guess this wouldn't work on GitHub Actions because this requires tokens like NPM_TOKEN and GITHUB_TOKEN, which would be set on TravisCI.

    env:
      GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      NPM_TOKEN: ${{ secrets.NPM_TOKEN }}

Unfortunately, I don't have permission to set up semantic-release.
@jquense Could you help us?

[eps1lon]

Yes, I forgot to mention that an admin needs to setup secrets.

[koba04]

What about removing the script?
Personally, I think it's good to release a new version manually instead of doing it on CI. I don't have the permission though.

[koba04]

I'd like to introduce some breaking changes like dropping IE support and removing PropTypes in the future. In that time, I'd like to release the breaking changes as a single major version, not separately.
But we can't do that because this script releases a new version automatically, so I'd like to remove running semantic-release on CI.

[eps1lon]

We can collect breaking changes on an alpha branch and merge that once it's ready. semantic-release will create an alpha release channel from that branch for test. We're doing that for @testing-library/react and it has been working great so far.

[eps1lon]

Will re-open from this remote. Otherwise we'll not get a run. Once it's merged forks will trigger Actions.