Add utility functions to git_repository

git_repository.py

@@ -16,9 +16,14 @@ class GitRepository():
         inst.latest_commit = commit_string
         return inst
 
+    def get_latest_n_commits(self, n: int):
+        self.system_repository.run_checked('git', 'log', '--oneline', '--format="%s %b"', f'-n {n}')
+        return self.system_repository.stdout
+
     def get_latest_commit(self):
-        self.system_repository.run_checked('git', 'log', '--oneline', '--format="%s %b"', '-n 1')
-        self.latest_commit = " ".join(self.system_repository.stdout) # returns a list of strings otherwise
+        output = self.get_latest_n_commits(1)
+        self.latest_commit = " ".join(output) # returns a list of strings otherwise
+        return self.latest_commit
 
     def get_release_type_from_latest_commit(self):
         if self.latest_commit is None:
@@ -38,6 +43,9 @@ class GitRepository():
     def tag_annotated(self, annotation: str, message: str):
         self.system_repository.run_checked('git', 'tag', '-a', annotation, '-m', message)
 
+    def tag_annotated(self, annotation: str, message: str, count: int):
+        self.system_repository.run_checked('git', 'tag', '-a', annotation, '-m', message, f'HEAD~{count}')
+
     def get_current_branch(self):
         self.system_repository.run_checked('git', 'branch', '--show-current')