ci: check commits are GPG signed #205

Job	Run time
Prepare	4s
Docs - stable toolchain (recent)	1m 4s
Check WASM	38s
Test - stable toolchain	3m 57s
Format - nightly toolchain	16s
Test - nightly toolchain	4m 43s
Lint - nightly toolchain (recent)	40s
Check Fuzz	38s
Test - MSRV	4m 20s
Docs - nightly toolchain (recent)	1m 9s
	17m 29s

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