GTK build with dotnet6+xbuild #2595

Job	Run time
linux20-vanilla--stockmono-only	1m 54s
linux20-github--dotnet-and-mono	4m 7s
linux20-vanilla--newmono-only	11m 38s
linux20-github--dotnet-and-newmono	4m 25s
linux22-github--dotnet-and-mono	4m 58s
linux22-github--dotnet-and-newmono	4m 24s
linux22-vanilla--newmono-only	9m 39s
linux22-vanilla--stockdotnet6-and-newmono	6m 30s
linux22-vanilla--stockdotnet6-and-stockmono	7m 2s
linux22-vanilla--stockdotnet6-only	7m 23s
linux22-vanilla--stockmono-only	1m 26s
macOS--dotnet6-and-mono	7m 6s
macOS--mono-only	23m 3s
macOS--dotnet6-only	4m 54s
windows--dotnet6-and-legacyFramework	8m 25s
windows--dotnet6-only	7m 54s
windows--legacyFramework-only	15m 56s
conventions	0s
snap_pkg	0s
	2h 10m 44s

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