Orka SSH Executor

⚠ This MR is based on top of !124 (closed) ⚠

Please merge first the dependent MR, then change the target branch here to master and continue with review

Issue: #35 (closed)

Implement the SSH Executor. Turns out after the last MR nothing much remains! 😄

How to test this MR

Run scripts/orka_integration/run.sh with the necessary variables (see comment on top of script)