Add support for SSH certs #175

Job	Run time
Check spelling	12s
Check formatting (ubuntu-latest)	11s
Clippy lints (ubuntu-latest)	21s
Check formatting (macos-latest)	7s
Integration tests (ubuntu-latest)	6h 0m 15s
Clippy lints (macos-latest)	1m 1s
Unit tests (ubuntu-latest)	43s
Check formatting (windows-latest)	19s
Clippy lints (windows-latest)	2m 10s
Unit tests (macos-latest)	1m 4s
Unit tests (windows-latest)	50s
Integration tests (macos-latest)	6h 0m 15s
Integration tests (windows-latest, true)	2m 34s
	12h 10m 2s

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