feat: Add graceful shutdown #57

Job	Run time
Detect relevant changed files	8s
Build/Publish arm64 Image	6m 6s
Build/Publish amd64 Image	7m 18s
Run cargo-udeps	1m 58s
Publish/Sign 0.0.0-pr788 Index	28s
Package/Publish 0.0.0-pr788 Helm Chart	33s
Run OpenShift Preflight Check for 0.0.0-pr788-amd64	19s
Run OpenShift Preflight Check for 0.0.0-pr788-arm64	20s
Failure Notification	-1s
Finished Build and Publish	3s
	17m 12s

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