Add signal-reboot #1548

Job	Run time
Lint bash code with shellcheck	5s
Run go tests	15s
End-to-End test with kured with code and manifests from HEAD (command) (1.25)	19m 13s
End-to-End test with kured with code and manifests from HEAD (command) (1.26)	18m 18s
End-to-End test with kured with code and manifests from HEAD (command) (1.27)	19m 44s
End-to-End test with kured with code and manifests from HEAD (signal) (1.25)	15m 29s
End-to-End test with kured with code and manifests from HEAD (signal) (1.26)	14m 35s
End-to-End test with kured with code and manifests from HEAD (signal) (1.27)	15m 5s
Check docs for incorrect links	7s
Lint golang code	11s
Build image and scan it against known vulnerabilities	2m 40s
	1h 45m 42s

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