.github/workflows: adding sanity check step #16

Job	Run time
linux-newLTS-github--dotnet-and-msbuild	1m 15s
linux-newLTS-github--dotnet-and-xbuild	34s
linux-newLTS-vanilla--newmono	2m 16s
linux-newLTS-vanilla--dotnet6	52s
linux-newLTS-vanilla--stockmono	1m 25s
linux-oldLTS-github--dotnet-and-msbuild	1m 9s
linux-oldLTS-github--dotnet-and-xbuild	52s
linux-oldLTS-vanilla--newmono	2m 12s
linux-oldLTS-vanilla--stockmono	1m 15s
macOS--dotnet6-and-mono	1m 4s
macOS--mono	54s
windows--dotnet6	51s
windows--legacyFramework	10m 1s
sanity-check	0s
publish	0s
	24m 40s

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