docs: Document how to configure user-info-fetcher Keycloak user #2006

Job	Run time
Run Cargo Udeps	1m 58s
Decide if Helm charts are pushed to the helm repository based on action trigger	11s
Run Rustfmt	24s
Run RustDoc	1m 23s
Run Cargo Tests	38s
Run Cargo Deny (bans licenses sources)	26s
Run Cargo Deny (advisories)	25s
Run Clippy	37s
Check if committed Helm charts are up to date	46s
Check if committed README is the one we would render from the available parts	36s
All tests passed	6s
Package Charts, Build Docker Image and publish them - ubuntu-latest	14m 58s
Package Charts, Build Docker Image and publish them - ubicloud-standard-8-arm	11m 24s
Build and publish manifest list	41s
Run the OpenShift Preflight check on the published images	19s
	34m 52s

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