ci(pr-check): add tsv output verification

[cmdoret]

This PR adds:

• a dummy edf file for tests
• a check in pr-check that runs the submitted algorithm image on the dummy file and verifies the header of the output tsv file

Currently, it assumes thath the output header exactly matches:

onset	duration	eventType	confidence	channels	dateTime	recordingDuration

I am not sure this is a valid assumption.