Switch from Travis -> Github actions. (bp #948)

[mergify]

This is an automated backport of pull request #948 done by Mergify

Cherry-pick of dab7090 has failed:

On branch mergify/bp/rolling/pr-948
Your branch is up to date with 'origin/rolling'.

You are currently cherry-picking commit dab7090.
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	new file:   .github/workflows/test.yml

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  (use "git add/rm <file>..." as appropriate to mark resolution)

	deleted by them: .travis.yml

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[clalancette]

@maryaB-osr OK, this is happier now. Please take a look when you get a chance; once this is merged, I'll ask mergify to merge it onto the dashing, foxy, and rolling branches.

[maryaB-osr]

@clalancette This is already a backport from the original #948 targeting rolling. I'm not sure why I didn't backport to the other branches from the original PR, maybe I was concerned there'd be an issue (and there was!). I'll add the backport label to this now so it'll open the PRs for foxy and dashing

[maryaB-osr]

Sorry I just realized I forgot to remove eloquent from the backport-all label. Once #987 is in I'll merge this