Clean up precice-ci.yml

[peterrum]

FYI @davidscn

[bangerth]

I don't know anything about how these CI files should be written. This requires someone else's approval.

[marcfehling]

This looks really nice when you get the docker image in the github-actions script.

[bangerth]

@peterrum What's the status here?

[marcfehling]

I've solved the merge conflict by rebasing. @peterrum -- I hijacked your PR 🏴‍☠️

The permission denied error can be fixed by overriding the default container user, see also actions/checkout#956. I will push a fix in a separate commit.

I will also apply my suggestions in a separate commit. Updating to the latest preCICE 2.5.0 release yields a different output and thus lets the test fail. I will thus update to preCISE 2.4.0 instead. We can consider an update to 2.5.0 in a separate PR.

[peterrum]

@marcfehling Thanks for the follow-up commits! Looks good to me. I cannot approve my own PR^^

[marcfehling]

The PR has been around for a year. Let's merge this.