Flaky test TestMerge_invalidRepositoryPath

=== CONT  TestMerge_invalidRepositoryPath
=== RUN   TestMerge_trees/trivial_merge_succeeds
=== CONT  TestMerge_invalidRepositoryPath
    merge_test.go:96: 
        	Error Trace:	merge_test.go:96
        	Error:      	"merge: GitCommand: start [/tmp/gitaly-1242467918/1367739122/bin.d/gitaly-git2go-v14 merge]: fork/exec /tmp/gitaly-1242467918/1367739122/bin.d/gitaly-git2go-v14: text file busy" does not contain "merge: could not open repository"
        	Test:       	TestMerge_invalidRepositoryPath
--- FAIL: TestMerge_invalidRepositoryPath (0.06s)
=== CONT  TestMerge_recursive
=== RUN   TestMerge_trees/non-trivial_merge_succeeds
=== RUN   TestMerge_trees/multiple_files_succeed
--- PASS: TestMerge_recursive (0.13s)
=== RUN   TestMerge_trees/conflicting_merge_fails
--- PASS: TestMerge_trees (0.28s)
    --- PASS: TestMerge_trees/trivial_merge_succeeds (0.02s)
    --- PASS: TestMerge_trees/non-trivial_merge_succeeds (0.01s)
    --- PASS: TestMerge_trees/multiple_files_succeed (0.01s)
    --- PASS: TestMerge_trees/conflicting_merge_fails (0.01s)
FAIL
FAIL	gitlab.com/gitlab-org/gitaly/v14/cmd/gitaly-git2go	6.511s
?   	gitlab.com/gitlab-org/gitaly/v14/cmd/gitaly-git2go/commit	[no test files]
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