GTK build with dotnet6+xbuild #2648

Job	Run time
linux20-github--dotnet-and-newmono	4m 40s
linux20-vanilla--newmono-only	10m 17s
linux20-github--dotnet-and-mono	4m 12s
linux20-vanilla--stockmono-only	8m 31s
linux22-github--dotnet-and-mono	4m 52s
linux22-github--dotnet-and-newmono	9m 20s
linux22-vanilla--newmono-only	13m 20s
linux22-vanilla--stockdotnet6-and-newmono	7m 37s
linux22-vanilla--stockdotnet6-and-stockmono	5m 29s
linux22-vanilla--stockdotnet6-only	6m 56s
linux22-vanilla--stockmono-only	6m 12s
macOS--dotnet6-and-mono	19m 11s
macOS--dotnet6-only	5m 44s
macOS--mono-only	16m 5s
windows--dotnet6-and-legacyFramework	7m 19s
windows--dotnet6-only	7m 33s
windows--legacyFramework-only	15m 12s
conventions	1m 17s
snap_pkg	12m 22s
	2h 46m 9s

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