GTK build with dotnet6+xbuild #2596

Job	Run time
linux20-github--dotnet-and-mono	4m 29s
linux20-vanilla--newmono-only	10m 20s
linux20-github--dotnet-and-newmono	5m 12s
linux20-vanilla--stockmono-only	7m 10s
linux22-github--dotnet-and-mono	3m 55s
linux22-github--dotnet-and-newmono	5m 10s
linux22-vanilla--newmono-only	9m 45s
linux22-vanilla--stockdotnet6-and-newmono	8m 22s
linux22-vanilla--stockdotnet6-and-stockmono	7m 9s
linux22-vanilla--stockdotnet6-only	5m 33s
linux22-vanilla--stockmono-only	5m 55s
macOS--dotnet6-and-mono	6m 51s
macOS--dotnet6-only	5m 37s
macOS--mono-only	20m 15s
windows--dotnet6-and-legacyFramework	7m 47s
windows--dotnet6-only	8m 34s
windows--legacyFramework-only	17m 37s
conventions	1m 8s
snap_pkg	8m 11s
	2h 29m 0s

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