feat(desktop): list private known Desktops #9914

Job	Run time
Build public push gateway (linux/amd64)	35s
Build public push gateway (linux/arm64)	32s
Build (linux/arm64)	7m 15s
Build (linux/amd64)	8m 38s
Qualify relay image source	-1s
Publish public push gateway image	-1s
Merge ${{ matrix.variant }} multi-arch manifest	-1s
	16m 57s

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