Add test for server

A test fixture to start the server and a first test case is added.

The fixture tries to assure that the server is installed and running.
If it is not installed the fixture uses pip to install it.

The server and the installation by pip is run bei the same Python
executable that also runs pytest.

The github workflow for pytest is adapted to install akkudoktor-eos.

Signed-off-by: Bobby Noelte <b0661n0e17e@gmail.com>

.github/workflows/pytest.yml

@@ -23,7 +23,9 @@ jobs:
           sudo apt install -y libmariadb3 libmariadb-dev
           python -m pip install --upgrade pip
           pip install -r requirements.txt
+          pip install -r requirements-dev.txt
 
       - name: Run Pytest
         run: |
+          pip install -e .
           python -m pytest -vs --cov modules --cov-report term-missing tests/