Prevent unsigned tagging #6866

Job	Run time
build-linux-arm (nightly)	7m 36s
build-linux-musl (nightly)	3m 25s
build-linux-arm (stable)	7m 4s
build-linux-arm (1.65)	6m 4s
build-linux-musl (stable)	4m 2s
Lints	1m 5s
build (ubuntu-latest, nightly)	3m 5s
build-linux-musl (1.65)	4m 5s
Changelog Test	14s
build (ubuntu-latest, stable)	15m 40s
build (ubuntu-latest, 1.65)	2m 21s
udeps	2m 56s
build (macos-latest, nightly)	4m 36s
Security audit	13s
build (macos-latest, stable)	9m 50s
build (macos-latest, 1.65)	4m 56s
build (windows-latest, nightly)	5m 37s
build (windows-latest, stable)	20m 0s
build (windows-latest, 1.65)	7m 25s
	1h 50m 14s

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