[misnome]

Are there any CI/CD metasystems that aren't vendor locked-in? GitHub/even GitLab, Jenkins (freestyle and scripted)/Azure/Travis.... all vendor-specific, as far as I know.

Sure, have all the heavyweight stuff in separate scripts that are just called, but platform specification/multiple platform builds/specifics of caching/secret handling/deployment handling are always different. Some tools (e.g. codecov) do abstract over some platforms, but not all, and the GitHub Actions model of "here is a literally pre-prepared step in your pipeline" can be pretty appealing.

It's literally, pick your poison, and resign yourself to reimplementation if you ever need to switch platforms.