MK8S-25: Further factorize index.html file path generation

Simplify _get_index_file_paths() to use _get_repository_directories() output:
- Eliminates duplicate directory listing logic between the two methods
- _get_index_file_paths() now simply appends INDEX_HTML_FILENAME to each directory
- Maintains single source of truth for all repository directory paths
- Reduces code duplication and improves maintainability

Author: rdebay-scality

buildchain/buildchain/targets/repository.py

@@ -235,31 +235,11 @@ def _get_index_file_paths(self) -> List[Path]:
         Returns:
             List of all index.html file paths that should be created/cleaned
         """
-        # Repository-specific index files
-        index_files = [
-            self.rootdir / self.INDEX_HTML_FILENAME,
-            self.rootdir / self.ARCH / self.INDEX_HTML_FILENAME,
+        return [
+            directory / self.INDEX_HTML_FILENAME
+            for directory in self._get_repository_directories()
         ]
 
-        # Add saltenv index files for scality repository
-        saltenv_dir, top_saltenv_dir = self._get_saltenv_directories()
-        if saltenv_dir and top_saltenv_dir:
-            index_files.extend(
-                [
-                    # Repository-level saltenv structure
-                    saltenv_dir / self.INDEX_HTML_FILENAME,
-                    saltenv_dir / "redhat" / self.INDEX_HTML_FILENAME,
-                    saltenv_dir
-                    / "redhat"
-                    / str(self._releasever)
-                    / self.INDEX_HTML_FILENAME,
-                    # Top-level saltenv (for health check)
-                    top_saltenv_dir / self.INDEX_HTML_FILENAME,
-                ]
-            )
-
-        return index_files
-
     def _get_repository_directories(self) -> List[Path]:
         """Get all repository directories that need index.html files.