cleanup ghapp integration #571

Job	Run time
package	1m 28s
package	1m 28s
test (windows-2022, 6.0.x)	6m 12s
test (windows-2022, 6.0.x)	33m 21s
test (ubuntu-latest, 6.0.x)	22m 11s
test (ubuntu-latest, 6.0.x)	22m 11s
test (macos-latest, 6.0.x)	21m 44s
test (macos-latest, 6.0.x)	21m 44s
test (ubuntu-latest, mcr.microsoft.com/dotnet/sdk:6.0-alpine3.15, sh)	3m 45s
test (ubuntu-latest, mcr.microsoft.com/dotnet/sdk:6.0-alpine3.15, sh)	3m 45s
	2h 17m 49s

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