doc: comment on spark history integration #2131

Job	Run time
Run Cargo Udeps	1m 59s
Decide if Helm charts are pushed to the helm repository based on action trigger	4s
Run Cargo Deny (advisories)	27s
Run Rustfmt	25s
Run Cargo Deny (bans licenses sources)	28s
Run Clippy	38s
Check if committed README is the one we would render from the available parts	23s
Run Cargo Tests	35s
Run RustDoc	1m 15s
Check if committed Helm charts are up to date	51s
All tests passed	2s
Package Charts, Build Docker Image and publish them - ubicloud-standard-8-arm	11m 54s
Package Charts, Build Docker Image and publish them - ubuntu-latest	11m 57s
Build and publish manifest list	41s
Run the OpenShift Preflight check on the published images	18s
	31m 57s

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