GTK build with dotnet6+xbuild #2638

Job	Run time
macOS--mono-only	19m 5s
macOS--dotnet6-and-mono	22m 8s
linux22-github--dotnet-and-mono	4m 4s
linux22-vanilla--stockdotnet6-and-newmono	7m 56s
linux22-github--dotnet-and-newmono	9m 27s
linux22-vanilla--stockdotnet6-only	6m 28s
linux22-vanilla--stockmono-only	6m 8s
macOS--dotnet6-only	5m 21s
windows--dotnet6-and-legacyFramework	9m 33s
windows--dotnet6-only	13m 11s
windows--legacyFramework-only	13m 8s
linux20-github--dotnet-and-mono	4m 38s
linux20-github--dotnet-and-newmono	8m 51s
linux20-vanilla--newmono-only	10m 4s
linux20-vanilla--stockmono-only	7m 3s
linux22-vanilla--newmono-only	11m 32s
linux22-vanilla--stockdotnet6-and-stockmono	7m 6s
conventions	1m 22s
snap_pkg	0s
	2h 47m 5s

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