repository: Allow skipping verification for tests

Some tests have to explicitly create pack files with blobs that don't
match their ID. For those blobs the builtin verification of the
repository must be disabled.

internal/repository/repair_pack_test.go

@@ -102,7 +102,8 @@ func testRepairBrokenPack(t *testing.T, version uint) {
 
 	for _, test := range tests {
 		t.Run(test.name, func(t *testing.T) {
-			repo := repository.TestRepositoryWithVersion(t, version)
+			// disable verification to allow adding corrupted blobs to the repository
+			repo := repository.TestRepositoryWithBackend(t, nil, version, repository.Options{NoVerifyPack: true})
 
 			seed := time.Now().UnixNano()
 			rand.Seed(seed)