What this MR does / why does DuMux need it:
Adds a pipeline with C++20 and dune master, and pushes the corresponding pipeline with C++17 from MR to the scheduled pipelines.
Notes for the reviewer
Fixes #1169 (closed)
Depends on !3227 (merged) to be merged first
does the new code follow the style guide?
do the test pipelines pass? (see guide on how to run pipelines for a merge request)
is the code you changed and/or the new code you wrote covered in the test suite? (if not, extend the existing tests or write new ones)
does your change affect public interfaces or behavior, or, does it introduce a new feature? If so, document the change in
is the list of the header includes complete? ("include what you use")
all files have to end with a
\ncharacter. Make sure there is no
\ No newline at end of filecomment in "Changes" of this MR.