GTK build with dotnet6+xbuild #2657

Job	Run time
linux20-github--dotnet-and-newmono	9m 3s
linux20-vanilla--newmono-only	13m 34s
linux20-github--dotnet-and-mono	4m 12s
linux20-vanilla--stockmono-only	6m 55s
linux22-github--dotnet-and-mono	4m 14s
linux22-vanilla--newmono-only	10m 54s
linux22-github--dotnet-and-newmono	7m 39s
linux22-vanilla--stockdotnet6-and-newmono	6m 48s
linux22-vanilla--stockdotnet6-and-stockmono	7m 22s
linux22-vanilla--stockdotnet6-only	5m 29s
linux22-vanilla--stockmono-only	7m 6s
macOS--dotnet6-and-mono	20m 45s
macOS--dotnet6-only	4m 32s
macOS--mono-only	21m 14s
windows--dotnet6-and-legacyFramework	7m 56s
windows--legacyFramework-only	16m 34s
windows--dotnet6-only	9m 19s
conventions	1m 5s
snap_pkg	0s
	2h 44m 41s

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