chore: Add lint and format targets to Makefile

Added new targets to the Makefile to facilitate linting and formatting.
The `lint` target runs `ruff check` to identify code style issues,
and `lint-fix` applies automatic fixes. The `format` target uses
`uv format` to ensure consistent code style across the project.
These additions improve the development workflow by providing
convenient commands for maintaining code quality.

Signed-off-by: Chmouel Boudjnah <chmouel@redhat.com>

Author: chmouel

Makefile

@@ -3,3 +3,12 @@ all:
 
 html:
 	@uv run cfp-radar generate
+
+lint:
+	@uvx ruff check
+
+lint-fix:
+	@uvx ruff check --fix
+
+format:
+	@uv format

src/collector/sources/papercall.py

@@ -7,7 +7,13 @@
 import httpx
 from bs4 import BeautifulSoup
 
-from ...config import COUNTRY_ALIASES, GLOBAL_CONFERENCES, TARGET_COUNTRIES, TOPICS, normalize_country
+from ...config import (
+    COUNTRY_ALIASES,
+    GLOBAL_CONFERENCES,
+    TARGET_COUNTRIES,
+    TOPICS,
+    normalize_country,
+)
 from ...logging_config import get_logger
 from ..models import Event
 

src/config.py

@@ -63,6 +63,7 @@ def normalize_country(country: str) -> str:
     """Normalize country name variants to canonical form."""
     return COUNTRY_ALIASES.get(country.lower().strip(), country)
 
+
 DEFAULT_CONFIG_FILE = os.path.join(os.path.dirname(os.path.dirname(__file__)), "config.yaml")
 _config_file: str | None = None