Previously tests did not run after merging.
This lead to incompatible changes being merged right after one another.
By running tests on main we will notice breaks earlier.
Other options would be to require every PR to rebase on main before merging.
This is known as requiring linear history and can be changed in the project settings.
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>
