Drift detection

[ZIJ]

Currently Digger does neither provide drift detection, nor facilitates it

Approach suggested by Karl Taylor @ Bitmex: ability to run a cron-like job to check for drift with smth like driftctl

[fleroux514]

Will give it a shot

[motatoes]

@fleroux514 has pushed his initial implementation to branch on drift as well

https://github.com/diggerhq/digger/commits/feat/add-drift-detection-support

[ZIJ]

With the introduction of an orchestrator the approach will likely need to change somewhat - but to the better. We'd no longer be limited by Github Actions API and can be consistent across multiple CI providers.

[ZIJ]

Closing in favour of #715