Check line endings in CI

[lukasdreyer]

Feature request

Is your feature request related to a problem? Please describe.
Sometimes, files with line endings different to all the other files in t8code are introduced.

Describe the solution or feature you'd like
A CI workflow, that checks for correct lineendings

Describe alternatives you've considered
None

Estimated priority

"Priority: medium" Should be solved within half a year

Additional context
#1391

[Davknapp]

I propose to install a similar workflow as with the typo or indent workflow. We can probably check such things in a pre-commit hook and in a workflow if we write a proper-script for it.

[Davknapp]

Take care of trailing whitespace, too.

[sandro-elsweijer]

Our indent script checks that. But it seems like the api folder and some more folders were/are missing from the find_all_source_files.scp script. The solution decided on in the dev meeting is to change the find_all_source_files.scp in such a way, that it is a blacklist instead of a whitelist.

[sandro-elsweijer]

Our indent script checks that. But it seems like the api folder and some more folders were/are missing from the find_all_source_files.scp script. The solution decided on in the dev meeting is to change the find_all_source_files.scp in such a way, that it is a blacklist instead of a whitelist.

Okay I have to correct myself here, clang format cannot check for correct line endings