Code quality improvements (v0.2.0-pre-alpha) (#5)

* Bumped version to 0.2.0
* Implemented Github Actions for HACS, Hassfest, Linting
* Improved code quality (compliant with the linter now)
* Added link to the finish page to automatically login on the same device/browser

custom_components/auth_oidc/helpers.py

@@ -0,0 +1,12 @@
+"""Helper functions for the integration."""
+
+from homeassistant.components import http
+
+
+def get_url(path: str) -> str:
+    """Returns the requested path appended to the current request base URL."""
+    if (req := http.current_request.get()) is None:
+        raise RuntimeError("No current request in context")
+
+    base_uri = str(req.url).split("/auth", 2)[0]
+    return f"{base_uri}{path}"