Add support for SSH certs #191

Job	Run time
Check spelling	1m 4s
Check formatting (ubuntu-latest)	1m 9s
Check dependencies (ubuntu-latest)	3m 44s
Check formatting (macos-latest)	3m 0s
Check dependencies (macos-latest)	10m 23s
Integration tests (ubuntu-latest)	10m 14s
Check formatting (windows-latest)	3m 19s
Check dependencies (windows-latest)	8m 28s
Integration tests (macos-latest)	10m 16s
Integration tests (windows-latest, true)	2m 47s
Clippy lints (ubuntu-latest)	1m 12s
Unit tests (ubuntu-latest)	1m 32s
Clippy lints (macos-latest)	1m 54s
Unit tests (macos-latest)	3m 45s
Clippy lints (windows-latest)	3m 35s
Unit tests (windows-latest)	3m 2s
	1h 9m 24s

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