docs: Add docs on how use custom Python processors #2024

Job	Run time
Select target helm repository based on action trigger	1s
Run Cargo Udeps	1m 44s
Check if committed Helm charts are up to date	41s
Check if committed README is the one we would render from the available parts	20s
Run Cargo Deny (advisories)	55s
Run Clippy	29s
Run Cargo Deny (bans licenses sources)	57s
Run RustDoc	1m 15s
Run Rustfmt	18s
Run Cargo Tests	36s
All tests passed	1s
Package Charts, Build Docker Image and publish them - ubuntu-latest	11m 36s
Package Charts, Build Docker Image and publish them - ubicloud-standard-8-arm	10m 4s
Build and publish manifest list	40s
Run the OpenShift Preflight check on the published images	12s
	29m 49s

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