post_forum: log commit shas

Signed-off-by: Stephan Lachnit <stephanlachnit@debian.org>

post_forum.py

@@ -12,6 +12,8 @@ import yaml
 def main(api_key: str, commit_before_sha: str, commit_sha: str) -> int:
     return_code = 0
 
+    print(f'Iterating through changes in diff from {commit_before_sha} to {commit_sha}')
+
     # get git repo
     repo_path = pathlib.Path(__file__).parent
     repo = git.Repo(repo_path)