create RepositoryInitializer which can be used to create new files in the initial commit on a new repository

scm-plugins/scm-git-plugin/src/test/java/sonia/scm/repository/spi/SimpleGitWorkdirFactoryTest.java

@@ -70,6 +70,18 @@ public class SimpleGitWorkdirFactoryTest extends AbstractGitCommandTestBase {
     }
   }
 
+  @Test
+  public void shouldCheckoutDefaultBranch() {
+    SimpleGitWorkdirFactory factory = new SimpleGitWorkdirFactory(workdirProvider);
+
+    try (WorkingCopy<Repository, Repository> workingCopy = factory.createWorkingCopy(createContext(), null)) {
+      assertThat(new File(workingCopy.getWorkingRepository().getWorkTree(), "a.txt"))
+        .exists()
+        .isFile()
+        .hasContent("a\nline for blame");
+    }
+  }
+
   @Test
   public void cloneFromPoolShouldNotBeReused() {
     SimpleGitWorkdirFactory factory = new SimpleGitWorkdirFactory(workdirProvider);