Move continuous integrations testing to Github Actions under arfc/saltproc

[yardasol]

CI is currently on travis-ci under @andrewryh's account. This issue can be closed when continuous integration for SaltProc is set up to run via GitHub actions.

[andrewryh]

@yardasol Can you do that? Or does only me have permission to do it?

[munkm]

@andrewryh I think @yardasol should be able to do it without you. We'll let you know if we need anything to officially disconnect the Travis jobs.

[andrewryh]

@andrewryh I think @yardasol should be able to do it without you. We'll let you know if we need anything to officially disconnect the Travis jobs.

Thanks, @munkm