Add tutorials with DuMux as solver into system tests

[Fujikawas]

Checklist:

• I added a summary of any user-facing changes (compared to the last release) in the changelog-entries/<PRnumber>.md.
• I will remember to squash-and-merge, providing a useful summary of the changes of this PR.

[MakisH]

To test: trigger the run testsuite manual workflow with:

• use workflow from: dumuxsystemtest (not needed yet, maybe if you change the workflows)
• test suite dumux_test
• no arguments
• branch to take the system tests from: dumuxsystemtest
• logging: DEBUG

[IshaanDesai]

I got further in the debugging and now see the error:

#21 0.167 Cloning into 'dumux-adapter'...
#21 0.678 error: pathspec 'main' did not match any file(s) known to git
#21 ERROR: process "/bin/bash -c git clone --depth 1 https://github.com/precice/dumux-adapter.git &&    cd dumux-adapter &&     if [ -n \"${DUMUX_ADAPTER_PR}\" ]; then git fetch origin pull/${DUMUX_ADAPTER_PR}/head; fi &&     git checkout ${DUMUX_ADAPTER_REF} &&     cd .. &&    dunecontrol --opts=cmake-test.opts --only=dumux-adapter all" did not complete successfully: exit code: 1
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 > [micro-dumux dumux_adapter 6/6] RUN git clone --depth 1 https://github.com/precice/dumux-adapter.git &&    cd dumux-adapter &&     if [ -n "${DUMUX_ADAPTER_PR}" ]; then git fetch origin pull/${DUMUX_ADAPTER_PR}/head; fi &&     git checkout main &&     cd .. &&    dunecontrol --opts=cmake-test.opts --only=dumux-adapter all:
0.167 Cloning into 'dumux-adapter'...
0.678 error: pathspec 'main' did not match any file(s) known to git
------

It seems like git checkout main for the dumux-adapter did not work, although the main branch does exist.

[MakisH]

You are pulling with --depth 1, asking for the branch main, but the default branch is develop. There is no need for --depth 1 in this case: you want to change to other references, for which you need the full repository.

[Fujikawas]

With the last manual run of the test suite dumux_test, it takes about 6min51s to build the docker image(at least the DuMux part is newly built) and run the case. Next step would be to generate the reference solution.

The manual run before the change to the docker file failed for timeout. Possible reasons are: two times complete compilation of DUNE modules took double the time, or one of this compilations failed build of the adapter, as I built and tested locally to find that the solver can't find the adapter among the other DUNE modules.