feat: Add graceful shutdown #60

Job	Run time
Detect relevant changed files	5s
Run cargo-udeps	2m 0s
Build/Publish arm64 Image	6m 13s
Build/Publish amd64 Image	6m 34s
Publish/Sign 0.0.0-pr747 Index	33s
Package/Publish 0.0.0-pr747 Helm Chart	25s
Run OpenShift Preflight Check for 0.0.0-pr747-arm64	20s
Run OpenShift Preflight Check for 0.0.0-pr747-amd64	17s
Finished Build and Publish	4s
Failure Notification	-30s
	16m 1s

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