build(debian): Avoid spamming .gitconfig with the same safe directory in local build #1909

Job	Run time
Flutter integration tests (windows)	7m 59s
C++ Quality Checks	2m 34s
Flutter Quality checks (ubuntu, p4w_ms_store)	1m 40s
Flutter Quality checks (ubuntu, ubuntupro)	4m 2s
Go Quality checks (ubuntu, agentapi)	1m 37s
Run Go tests with mocks (ubuntu, windows-agent)	4m 37s
Flutter Quality checks (windows, p4w_ms_store)	3m 29s
Go Quality checks (ubuntu, contractsapi)	1m 29s
Run Go tests with mocks (ubuntu, wsl-pro-service)	3m 20s
Flutter Quality checks (windows, ubuntupro)	4m 30s
Go Quality checks (ubuntu, mocks)	1m 10s
Run Go tests with mocks (windows, storeapi/go-wrapper/microsoftstore)	5m 15s
Go Quality checks (ubuntu, storeapi/go-wrapper/microsoftstore)	1m 26s
Run Go tests with mocks (windows, windows-agent)	3m 31s
Go Quality checks (ubuntu, windows-agent)	43s
Run Go tests with mocks (windows, common)	3m 15s
Go Quality checks (ubuntu, wsl-pro-service)	43s
Go Quality checks (ubuntu, common)	58s
Go Quality checks (windows, agentapi)	5m 56s
Go Quality checks (windows, contractsapi)	4m 36s
Go Quality checks (windows, mocks)	5m 29s
Go Quality checks (windows, storeapi/go-wrapper/microsoftstore)	5m 52s
Go Quality checks (windows, windows-agent)	6m 54s
Go Quality checks (windows, end-to-end)	5m 27s
Go Quality checks (windows, common)	6m 3s
	1h 32m 35s

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