MassInstallAction: Install the CI workflow on this repository

[timholy]

This pull request sets up the CI workflow on this repository.

[codecov]

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[ViralBShah]

The tests run fine locally for me, but not in CI. @daviehh Since you provided the PR that made this package run on my mac, I wonder if you have any thoughts here.

[ViralBShah]

Merging this to switch on the CI, and subsequent PRs need to make the CI pass.

[ViralBShah]

@giordano @staticfloat Would you know why these tests that are basically dlopening Accelerate and calling simple functions, failing in CI, but would pass locally?

[daviehh]

According to the report in #43 (comment), it may be a macos bug: some version in of macos 11.x may have some bugs that missed some symbols; all test runs fine on 12.x