ci: nextest, coverage, cargo-deny licenses, PR-merge comment workflow #318

Job	Run time
Coverage (llvm-cov)	2m 42s
version	3s
lint	1m 5s
security	24s
mutation	1m 36s
test (ubuntu-latest)	45s
cargo-deny (advisories + licenses)	24s
test (windows-latest)	52s
test (macos-latest)	48s
	8m 39s

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