[ci] change ubuntu version in gitlab-ci to 22.04
What this MR does / why does DuMux need it:
3.7 needs to be tested on ubuntu 22.04 before removing the 20.04 image from dumux-docker-ci
Required for dumux-docker-ci#11 (closed)
Before you request a review from someone, make sure to revise the following points:
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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 CHANGELOG.md
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is the list of the header includes complete? ("include what you use") -
all files have to end with a \n
character. Make sure there is no\ No newline at end of file
comment in "Changes" of this MR.
Edited by Leon Keim