Track issuer key usages #1312

Job	Run time
Check semver compatibility	1m 1s
Documentation (stable)	58s
Documentation (nightly)	1m 1s
Validate external types appearing in public API	1m 31s
build (macOS-latest, stable)	4m 10s
Format & clippy	5m 20s
build (ubuntu-latest, stable)	5m 38s
build (ubuntu-latest, beta)	5m 37s
Build rustls-cert-gen as a standalone package	28s
build (ubuntu-latest, nightly)	5m 35s
build-windows	13m 33s
build (ubuntu-latest, stable 7 months ago)	51s
Measure coverage	5m 54s
	51m 37s

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