[releaser] Update to use git add -u as requested by maintainer

- Changed from selective file staging to git add -u approach
- Stages all modified tracked files for better future compatibility
- Maintains security by not adding untracked files
- Addresses maintainer feedback for automatic version bumping support

Author: Srinath0916

openwisp_utils/releaser/release.py

@@ -358,17 +358,11 @@ def main():
         ["git", "checkout", "-b", release_branch], check=True, capture_output=True
     )
 
-    print("Adding release-related files to git...")
-    # Add only the specific files that were modified during the release process
-    files_to_add = [config["changelog_path"]]
-
-    # Add version file if it exists and was modified
-    version_path = config.get("version_path")
-    if version_path and os.path.exists(version_path):
-        files_to_add.append(version_path)
-
-    for file_path in files_to_add:
-        subprocess.run(["git", "add", file_path], check=True, capture_output=True)
+    print("Adding all modified tracked files to git...")
+    # Using 'git add -u' to stage all modified tracked files
+    # This includes changelog, version files, and any other modified files
+    # which is useful for supporting automatic version bumping across different repo types
+    subprocess.run(["git", "add", "-u"], check=True, capture_output=True)
 
     commit_message = f"{new_version} release"
     subprocess.run(