Fix git issue in buildscript

[psx95]

Contains the safe directory git issue fix to resolve -

go test -run TestAgentIntegration -run_only_profiler_backoff_test -timeout 1h
--- FAIL: TestAgentIntegration (0.01s)
    integration_test.go:239: failed to gather the Git revision of the current source: exit status 128
FAIL
exit status 1

For some reason the continuous builds did not show the explicit safe directory issue. The actual issue was revealed when a manual build was triggered.