GTK build with dotnet6+xbuild #2598

Job	Run time
linux20-vanilla--stockmono-only	7m 40s
linux20-github--dotnet-and-mono	4m 32s
linux20-vanilla--newmono-only	10m 23s
linux20-github--dotnet-and-newmono	4m 56s
linux22-github--dotnet-and-mono	5m 12s
linux22-github--dotnet-and-newmono	5m 6s
linux22-vanilla--newmono-only	10m 15s
linux22-vanilla--stockdotnet6-and-newmono	6m 33s
linux22-vanilla--stockdotnet6-and-stockmono	7m 27s
linux22-vanilla--stockdotnet6-only	5m 30s
linux22-vanilla--stockmono-only	7m 10s
macOS--dotnet6-and-mono	6m 47s
macOS--dotnet6-only	4m 49s
macOS--mono-only	18m 26s
windows--dotnet6-and-legacyFramework	8m 51s
windows--dotnet6-only	9m 13s
windows--legacyFramework-only	9m 15s
conventions	1m 7s
snap_pkg	42s
	2h 13m 54s

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