[!75] Feature/add examples to testsuite

Merge branch 'feature/add-examples-to-testsuite' into 'master'

ref:extensions/dune-foamgrid\> Depends on [!74] to be merged.

See merge request [!75]

  [!74]: gitlab.dune-project.org/NoneNone/merge_requests/74
  [!75]: gitlab.dune-project.org/extensions/dune-foamgrid/merge_requests/75
6 jobs for master in 5 minutes and 40 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Test
passed #146746
duneci
debian:10 clang-7-libcpp-17

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passed #146745
duneci
debian:10 gcc-7-17

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passed #146744
duneci
debian:10 gcc-8-noassert-17

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duneci
debian:11 gcc-9-20

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passed #146748
duneci
dune:2.6 ubuntu:18.04 clang-6-17

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passed #146747
duneci
ubuntu:18.04 clang-6-17

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