feat: Add graceful shutdown #51

Job	Run time
Detect relevant changed files	6s
Build/Publish amd64 Image	6m 21s
Run cargo-udeps	2m 5s
Build/Publish arm64 Image	5m 30s
Publish/Sign 0.0.0-pr730 Index	31s
Package/Publish 0.0.0-pr730 Helm Chart	30s
Run OpenShift Preflight Check for 0.0.0-pr730-arm64	18s
Run OpenShift Preflight Check for 0.0.0-pr730-amd64	20s
Failure Notification	-1s
Finished Build and Publish	3s
	15m 43s

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