Support for fallback keys #23

Job	Run time
Linting	2m 10s
Build for Linux (linux, amd64)	3m 47s
Unit tests	2m 40s
Build for Linux (linux, 386)	1m 54s
Build for Windows (windows, amd64)	2m 2s
WASM build test	0s
Initial tests passed	1s
Sytest (SQLite native)	4m 41s
Sytest (SQLite Cgo)	4m 11s
Integration tests	5m 7s
Upgrade tests	32s
Sytest (PostgreSQL)	6m 1s
Complement (SQLite native)	4m 15s
Complement (SQLite Cgo)	4m 40s
Upgrade tests from HEAD-2	29s
Complement (PostgreSQL)	8m 20s
Integration tests passed	2s
Update Docker images	0s
	50m 52s

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