Add assets and tests

[safoinme]

No description provided.

[github-actions]

Images automagically compressed by Calibre's image-actions ✨

Compression reduced images by 19.3%, saving 33.80 KB.

Filename	Before	After	Improvement	Visual comparison
assets/deploy_pipeline.png	41.00 KB	33.13 KB	-19.2%	View diff
assets/promote_pipeline.png	48.41 KB	39.01 KB	-19.4%	View diff
assets/training_pipeline.png	85.82 KB	69.29 KB	-19.3%	View diff

2 images did not require optimisation.

[avishniakov]

I'm not very sure why it was behaving like this (don't have access to repo settings to check), but check out in composite action was not picking ref properly, and tried to check out the main instead of the PR branch - added explicit ref from main ci flow.
I also removed the commit to develop from triggers, since you develop directly in this branch.