GTK build with dotnet6+xbuild #2650

Job	Run time
linux20-github--dotnet-and-mono	4m 9s
linux20-github--dotnet-and-newmono	7m 16s
linux20-vanilla--newmono-only	10m 54s
linux20-vanilla--stockmono-only	6m 47s
linux22-github--dotnet-and-mono	4m 58s
linux22-github--dotnet-and-newmono	9m 50s
linux22-vanilla--newmono-only	10m 47s
linux22-vanilla--stockdotnet6-and-newmono	7m 22s
linux22-vanilla--stockdotnet6-and-stockmono	6m 40s
linux22-vanilla--stockdotnet6-only	6m 26s
linux22-vanilla--stockmono-only	5m 55s
macOS--dotnet6-and-mono	20m 13s
macOS--dotnet6-only	5m 8s
macOS--mono-only	19m 26s
windows--dotnet6-and-legacyFramework	7m 17s
windows--legacyFramework-only	14m 2s
windows--dotnet6-only	7m 35s
conventions	1m 45s
snap_pkg	10m 15s
	2h 46m 45s

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