Refactor Docker setup and migration scripts

- Updated Dockerfile to set permissions for the entrypoint script and defined the entrypoint for the container.
- Consolidated Alembic migration history into a single initial migration file and removed obsolete revision files.
- Added a new script to run Alembic migrations before starting the application.
- Updated changelog to reflect changes in migration handling and Docker setup.
- Enhanced pytest configuration for coverage reporting and excluded specific files from coverage calculations.

scripts/run_migrations.py

@@ -0,0 +1,42 @@
+"""Utility for applying Alembic migrations before application startup."""
+from __future__ import annotations
+
+import logging
+from pathlib import Path
+
+from alembic import command
+from alembic.config import Config
+from dotenv import load_dotenv
+
+logging.basicConfig(level=logging.INFO)
+logger = logging.getLogger(__name__)
+
+
+def _load_env() -> None:
+    """Ensure environment variables from .env are available."""
+    load_dotenv()
+
+
+def _alembic_config(project_root: Path) -> Config:
+    config_path = project_root / "alembic.ini"
+    if not config_path.exists():
+        raise FileNotFoundError(f"Missing alembic.ini at {config_path}")
+
+    config = Config(str(config_path))
+    config.set_main_option("script_location", str(project_root / "alembic"))
+    return config
+
+
+def run_migrations(target_revision: str = "head") -> None:
+    """Apply Alembic migrations up to the given revision."""
+    project_root = Path(__file__).resolve().parent.parent
+    _load_env()
+
+    config = _alembic_config(project_root)
+    logger.info("Applying database migrations up to %s", target_revision)
+    command.upgrade(config, target_revision)
+    logger.info("Database migrations applied successfully")
+
+
+if __name__ == "__main__":
+    run_migrations()