feat: graceful(er) server shutdown #1681

Job	Run time
Run Cargo Deny (advisories)	56s
Check if committed README is the one we would render from the available parts	19s
Run Clippy	30s
Check if committed Helm charts are up to date	33s
Run Cargo Deny (bans licenses sources)	40s
Run RustDoc	1m 5s
Run Rustfmt	12s
Run Cargo Tests	34s
Run Cargo Udeps	1m 18s
Select target helm repository based on action trigger	1s
All tests passed	1s
Package Charts, Build Docker Image and publish them - ubuntu-latest	10m 17s
Package Charts, Build Docker Image and publish them - ubicloud-standard-8-arm	9m 19s
Build and publish manifest list	48s
Run the OpenShift Preflight check on the published images	13s
	26m 46s

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