Add tests for pandapower

[jkisse]

It would be good to automatically run the pandamodels-tests of pandapower for every change in pandamodels. Similar to the "relying" tests that are run in the pandapower-CI for pandapipes and simbench here: https://github.com/e2nIEE/pandapower/blob/develop/.github/workflows/github_test_action.yml#L65

Ideally, it should be required that these tests pass before pull requests can be merged.

[ZhengLiu1119]

hi,

sorry for the really late answer. I get an Error after adding the "relaying Test"

ERROR: file:///home/runner/work/PandaModels.jl/PandaModels.jl does not appear to be a Python project: neither 'setup.py' nor 'pyproject.toml' found.
Error: Process completed with exit code 1.

or

https://github.com/e2nIEE/PandaModels.jl/actions/runs/3069230918/jobs/4957635515

do you have an idea?