GTK build with dotnet6+xbuild #2658

Job	Run time
macOS--dotnet6-and-mono	22m 17s
linux22-github--dotnet-and-newmono	7m 59s
linux22-github--dotnet-and-mono	3m 56s
linux22-vanilla--stockmono-only	6m 58s
macOS--dotnet6-only	8m 41s
windows--dotnet6-only	8m 48s
windows--legacyFramework-only	13m 40s
macOS--mono-only	16m 24s
linux20-github--dotnet-and-mono	4m 23s
linux20-github--dotnet-and-newmono	8m 6s
linux20-vanilla--newmono-only	11m 3s
linux20-vanilla--stockmono-only	6m 19s
linux22-vanilla--newmono-only	12m 35s
linux22-vanilla--stockdotnet6-and-newmono	6m 18s
linux22-vanilla--stockdotnet6-and-stockmono	7m 23s
linux22-vanilla--stockdotnet6-only	5m 47s
windows--dotnet6-and-legacyFramework	9m 13s
conventions	1m 13s
snap_pkg	9m 16s
	2h 50m 19s

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