feat: Add graceful shutdown #54

Job	Run time
Detect relevant changed files	5s
Build/Publish amd64 Image	7m 56s
Build/Publish arm64 Image	6m 30s
Run cargo-udeps	2m 26s
Publish/Sign 0.0.0-pr674 Index	27s
Package/Publish 0.0.0-pr674 Helm Chart	27s
Run OpenShift Preflight Check for 0.0.0-pr674-arm64	20s
Run OpenShift Preflight Check for 0.0.0-pr674-amd64	24s
Failure Notification	-1s
Finished Build and Publish	4s
	18m 38s

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