Smoke Test integration

[micoleaoo]

Solves all tasks of issue #17
Integration of general Smoke Test in /tests, which validates basic and critical functions of the tesp-api.

[BorisYourich]

Thanks, time to add them to CI

[micoleaoo]

All core tests execute successfully, with the exception of one that relies on workdir.json. The issue lies in the implementation; run_script.sh files are being mounted to workdir, which fails with special directories like /proc in the case of the failed test.

Suggested solution:
Run script files should have a stable bind-mount directory such as /tmp/{job_id} or similar.