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NSEC3 and multiple key signing support. #4335

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Job	Run time
Check minimal versions	2m 29s
test (ubuntu-latest, 1.76.0)	2m 24s
Build examples (1.78.0)	1m 27s
Build examples (stable)	1m 27s
test (ubuntu-latest, stable)	2m 51s
Build examples (beta)	1m 35s
test (ubuntu-latest, beta)	2m 12s
Build examples (nightly)	1m 23s
test (ubuntu-latest, nightly)	1m 49s
test (windows-latest, 1.76.0)	6m 8s
test (windows-latest, stable)	5m 55s
test (windows-latest, beta)	4m 54s
test (windows-latest, nightly)	6m 20s
test (macOS-latest, 1.76.0)	4m 41s
test (macOS-latest, stable)	2m 2s
test (macOS-latest, beta)	2m 8s
test (macOS-latest, nightly)	2m 42s
	52m 27s