GTK build with dotnet6+xbuild #2749

Job	Run time
macOS--dotnet6-and-mono	20m 6s
windows--dotnet6-only	8m 5s
macOS--mono-only	17m 34s
macOS--dotnet6-only	5m 34s
windows--legacyFramework-only	20m 15s
windows--dotnet6-and-legacyFramework	7m 48s
linux20-github--dotnet-and-mono	4m 22s
linux20-github--dotnet-and-newmono	9m 17s
linux20-vanilla--newmono-only	10m 52s
linux20-vanilla--stockmono-only	7m 1s
linux22-github--dotnet-and-mono	4m 25s
linux22-github--dotnet-and-newmono	7m 49s
linux22-vanilla--newmono-only	10m 27s
linux22-vanilla--stockdotnet6-and-newmono	9m 0s
linux22-vanilla--stockdotnet6-and-stockmono	8m 7s
linux22-vanilla--stockdotnet6-only	7m 46s
linux22-vanilla--stockmono-only	7m 20s
conventions	1m 11s
snap_pkg	8m 46s
	2h 55m 45s

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