Merge pull request #2689 from tollb/fix/delete_tmp_dir_when_build_check_ok

Delete temporary directory on successful build

src/libstore/build.cc

@@ -1680,6 +1680,7 @@ void DerivationGoal::buildDone()
         }
 
         if (buildMode == bmCheck) {
+            deleteTmpDir(true);
             done(BuildResult::Built);
             return;
         }