Add Gitea CI workflow; fix ruff lint issues

sbin/gen_icons.py

@@ -1,5 +1,7 @@
 """Generate solid-color PNG icons for PWA manifest using stdlib only (no Pillow)."""
-import zlib, struct, os
+import zlib
+import struct
+import os
 
 def make_png(size, rgb=(0x25, 0x63, 0xEB)):
     """Create a minimal valid RGB PNG of the given size filled with one color."""

sbin/migrate_parent_key.py

@@ -16,7 +16,6 @@ Usage:
 
 import os
 import shutil
-import sys
 from datetime import date
 from pathlib import Path
 

sbin/setup_mariadb.py

@@ -31,11 +31,11 @@ from pathlib import Path
 REPO_ROOT = Path(__file__).resolve().parent.parent
 sys.path.insert(0, str(REPO_ROOT))
 
-from sqlalchemy import create_engine, text
-from sqlalchemy.orm import sessionmaker
+from sqlalchemy import create_engine, text  # noqa: E402
+from sqlalchemy.orm import sessionmaker  # noqa: E402
 
-import config
-from models import Base, Battery, BatteryPctLog, CapacityTest, ChargeLog, Device
+import config  # noqa: E402
+from models import Base, Battery, BatteryPctLog, CapacityTest, ChargeLog, Device  # noqa: E402
 
 
 # ---------------------------------------------------------------------------
@@ -62,7 +62,7 @@ def collect_credentials() -> str:
     """Return a MariaDB SQLAlchemy URL, prompting for any missing pieces."""
     url = os.environ.get("MARIADB_URL", "").strip()
     if url:
-        print(f"  Using MARIADB_URL from environment.")
+        print("  Using MARIADB_URL from environment.")
         return url
 
     print("Enter MariaDB connection details (press Enter to accept defaults):\n")