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.

model_manager/runtime_paths.py

@@ -0,0 +1,26 @@
+"""Filesystem layout for worker runtime data outside the application package tree."""
+
+from os import makedirs
+from os.path import join
+
+# Root for all mutable runtime data (not under /app; avoids clashing with git clone under /app).
+RUNTIME_DATA_ROOT = '/var/lib/model-manager'
+
+# Training reports (HTML, CSV exports, etc.) and related outputs.
+REPORTS_ROOT = join(RUNTIME_DATA_ROOT, 'reports')
+
+# Per-training run folders (name + timestamp); cleanup cron deletes stale entries here.
+REPORTS_TEMP_DIR = join(REPORTS_ROOT, 'temp')
+
+# Worker log files when file logging is wired; stdout remains primary until then.
+LOGS_DIR = join(RUNTIME_DATA_ROOT, 'logs')
+
+
+def ensure_runtime_directories() -> None:
+    """Create runtime directories expected by the worker process."""
+    # REPORTS_ROOT: base directory for report artifacts; remove if all outputs move elsewhere.
+    makedirs(REPORTS_ROOT, exist_ok=True)
+    # REPORTS_TEMP_DIR: transient run subdirs; remove after retention/cleanup is centralized.
+    makedirs(REPORTS_TEMP_DIR, exist_ok=True)
+    # LOGS_DIR: on-disk logs; remove if logging stays stdout-only forever.
+    makedirs(LOGS_DIR, exist_ok=True)