CI: create snap release #273

Job	Run time
linux-github--dotnet-and-newmono	6m 22s
linux-vanilla--newmono-only	8m 0s
linux-github--dotnet-and-mono	3m 33s
linux-vanilla--stockdotnet6-and-newmono	5m 40s
linux-vanilla--stockdotnet6-and-stockmono	6m 19s
linux-vanilla--stockdotnet6-only	4m 44s
linux-vanilla--stockmono-only	4m 49s
macOS--dotnet6-and-mono	16m 25s
macOS--dotnet6-only	4m 17s
macOS--mono-only	10m 34s
windows--dotnet6-and-legacyFramework	6m 46s
windows--dotnet6-only	6m 51s
windows--legacyFramework-only	14m 58s
conventions	1m 17s
snap_pkg_beta	6m 28s
snap_pkg	7m 33s
	1h 54m 36s

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