GTK build with dotnet6+xbuild #2647

Job	Run time
linux20-vanilla--newmono-only	10m 13s
linux20-github--dotnet-and-mono	4m 1s
linux20-github--dotnet-and-newmono	4m 50s
linux20-vanilla--stockmono-only	7m 5s
linux22-github--dotnet-and-mono	4m 28s
linux22-github--dotnet-and-newmono	4m 8s
linux22-vanilla--newmono-only	11m 49s
linux22-vanilla--stockdotnet6-and-newmono	6m 36s
linux22-vanilla--stockdotnet6-and-stockmono	6m 29s
linux22-vanilla--stockdotnet6-only	5m 32s
linux22-vanilla--stockmono-only	5m 57s
macOS--dotnet6-and-mono	20m 51s
macOS--dotnet6-only	5m 52s
macOS--mono-only	23m 46s
windows--dotnet6-and-legacyFramework	8m 10s
windows--dotnet6-only	9m 15s
windows--legacyFramework-only	15m 22s
conventions	1m 9s
snap_pkg	11m 41s
	2h 47m 14s

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