CI/CD hardening: lint, secret scan, coverage gate, auto CVE-fix PRs, GHCR + GitHub mirror publishing (#34)

- release changelog: commits rendered as description (link), divider lines dropped
- gitleaks secret scan and hadolint on every push/PR
- ruff lint/format gate (Python repos) with a pytest --cov-fail-under gate
- scheduled CRITICAL Trivy failures attempt an apk upgrade rebuild and open a follow-up PR if it clears the finding, instead of just failing red
- images also published to ghcr.io/djeex/<repo>
- a matching GitHub Release is created on the GitHub mirror, with a notice pointing back to this repo as the source of truth

src/py/builder/utils.py

@@ -1,26 +1,30 @@
-import yaml
 import logging
 from pathlib import Path
-from shutil import copytree, rmtree, copyfile
+from shutil import copytree, rmtree
+
+import yaml
+
 
 def load_yaml(path):
     """Load gallery and site .yaml conf"""
     if not path.exists():
         logging.warning(f"[!] YAML file not found: {path}")
         return {}
-    with open(path, "r", encoding="utf-8") as f:
+    with open(path, encoding="utf-8") as f:
         return yaml.safe_load(f)
 
+
 def load_theme_config(theme_name, themes_dir):
     """Load theme.yaml"""
     theme_dir = themes_dir / theme_name
     theme_config_path = theme_dir / "theme.yaml"
     if not theme_config_path.exists():
         raise FileNotFoundError(f"[✗] Theme config not found: {theme_config_path}")
-    with open(theme_config_path, "r", encoding="utf-8") as f:
+    with open(theme_config_path, encoding="utf-8") as f:
         theme_vars = yaml.safe_load(f)
     return theme_vars, theme_dir
 
+
 def clear_dir(path: Path):
     """Clear the output dir"""
     if not path.exists():
@@ -32,6 +36,7 @@ def clear_dir(path: Path):
         elif child.is_dir():
             rmtree(child)
 
+
 def ensure_dir(path: Path):
     """Create the output dir if it does not exist"""
     if not path.exists():
@@ -39,6 +44,7 @@ def ensure_dir(path: Path):
     else:
         clear_dir(path)
 
+
 def copy_assets(js_dir, style_dir, build_dir):
     """Copy public assets to output dir"""
     for folder in [js_dir, style_dir]: