External keys #813

Job	Run time
Clippy (--all-features)	4m 48s
Clippy (--no-default-features --features ring)	4m 35s
Documentation (stable)	34s
Clippy (--no-default-features --features aws_lc_rs)	4m 37s
Format	8s
Documentation (beta)	41s
Clippy (--no-default-features --features aws_lc_rs,pem)	4m 36s
Documentation (nightly)	42s
Documentation (stable 7 months ago)	45s
build (macOS-latest, stable)	1m 29s
build-windows	8m 28s
build (ubuntu-latest, stable)	5m 36s
build (ubuntu-latest, beta)	39s
Validate external types appearing in public API	1m 20s
build (ubuntu-latest, nightly)	5m 26s
Check semver compatibility	30s
build (ubuntu-latest, stable 7 months ago)	43s
Build rustls-cert-gen as a standalone package	29s
Measure coverage	53s
	46m 59s

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