GTK build with dotnet6+xbuild #2639

Job	Run time
macOS--dotnet6-only	8m 23s
macOS--dotnet6-and-mono	25m 59s
macOS--mono-only	19m 14s
linux22-github--dotnet-and-mono	4m 28s
windows--dotnet6-and-legacyFramework	12m 45s
windows--dotnet6-only	8m 24s
linux20-github--dotnet-and-mono	4m 46s
windows--legacyFramework-only	14m 13s
linux20-github--dotnet-and-newmono	9m 0s
linux20-vanilla--newmono-only	10m 58s
linux20-vanilla--stockmono-only	6m 12s
linux22-github--dotnet-and-newmono	8m 27s
linux22-vanilla--newmono-only	12m 17s
linux22-vanilla--stockdotnet6-and-newmono	6m 33s
linux22-vanilla--stockdotnet6-and-stockmono	8m 28s
linux22-vanilla--stockdotnet6-only	5m 47s
linux22-vanilla--stockmono-only	5m 59s
conventions	1m 48s
snap_pkg	0s
	2h 53m 41s

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