feat: update values.yaml and refactor cleanup paths

- Changed project name in values.yaml from "sientia-dataops-model-manager" to "sientia-model-manager".
- Added new environment variables for GitHub repository and branch configuration.
- Refactored cleanup paths to use a centralized REPORTS_TEMP_DIR constant for consistency.
- Updated runtime configurations and adjusted volume mounts for better resource management.
- Enabled SSH access for the model manager and disabled Grafana dashboard creation.
- Updated tests to reflect changes in directory paths and environment variable usage.

tests/test_runtime_paths.py

@@ -0,0 +1,18 @@
+"""Tests for runtime filesystem layout constants."""
+
+from unittest.mock import patch
+
+
+def test_ensure_runtime_directories_creates_expected_paths():
+    from model_manager.runtime_paths import (
+        LOGS_DIR,
+        REPORTS_ROOT,
+        REPORTS_TEMP_DIR,
+        ensure_runtime_directories,
+    )
+
+    with patch('model_manager.runtime_paths.makedirs') as makedirs_mock:
+        ensure_runtime_directories()
+
+    created = {call.args[0] for call in makedirs_mock.call_args_list}
+    assert created == {REPORTS_ROOT, REPORTS_TEMP_DIR, LOGS_DIR}