Dependency Update, Added examples/basic, CI

Updated the dependencies to the newest version.
Added `AsRef` and `Deref` traits to the extractors.
Moved the example from `README.md` to `examples/basic`.
Added a CI Pipeline.

examples/basic/src/main.rs

@@ -0,0 +1,72 @@
+use axum::{
+    error_handling::HandleErrorLayer, http::Uri, response::IntoResponse, routing::get, Router,
+};
+use axum_oidc::{
+    error::MiddlewareError, EmptyAdditionalClaims, OidcAuthLayer, OidcClaims, OidcLoginLayer,
+};
+use tokio::net::TcpListener;
+use tower::ServiceBuilder;
+use tower_sessions::{
+    cookie::{time::Duration, SameSite},
+    Expiry, MemoryStore, SessionManagerLayer,
+};
+
+#[tokio::main]
+async fn main() {
+    let session_store = MemoryStore::default();
+    let session_layer = SessionManagerLayer::new(session_store)
+        .with_secure(false)
+        .with_same_site(SameSite::Lax)
+        .with_expiry(Expiry::OnInactivity(Duration::seconds(120)));
+
+    let oidc_login_service = ServiceBuilder::new()
+        .layer(HandleErrorLayer::new(|e: MiddlewareError| async {
+            e.into_response()
+        }))
+        .layer(OidcLoginLayer::<EmptyAdditionalClaims>::new());
+
+    let oidc_auth_service = ServiceBuilder::new()
+        .layer(HandleErrorLayer::new(|e: MiddlewareError| async {
+            e.into_response()
+        }))
+        .layer(
+            OidcAuthLayer::<EmptyAdditionalClaims>::discover_client(
+                Uri::from_static("http://localhost:8080"),
+                "https://auth.zettoit.eu/realms/zettoit".to_string(),
+                "oxicloud".to_string(),
+                Some("IvBcDOfp9WBfGNmwIbiv67bxCwuQUGbl".to_owned()),
+                vec![],
+            )
+            .await
+            .unwrap(),
+        );
+
+    let app = Router::new()
+        .route("/foo", get(authenticated))
+        .layer(oidc_login_service)
+        .route("/bar", get(maybe_authenticated))
+        .layer(oidc_auth_service)
+        .layer(session_layer);
+
+    let listener = TcpListener::bind("[::]:8080").await.unwrap();
+    axum::serve(listener, app.into_make_service())
+        .await
+        .unwrap();
+}
+
+async fn authenticated(claims: OidcClaims<EmptyAdditionalClaims>) -> impl IntoResponse {
+    format!("Hello {}", claims.subject().as_str())
+}
+
+async fn maybe_authenticated(
+    claims: Option<OidcClaims<EmptyAdditionalClaims>>,
+) -> impl IntoResponse {
+    if let Some(claims) = claims {
+        format!(
+            "Hello {}! You are already logged in from another Handler.",
+            claims.subject().as_str()
+        )
+    } else {
+        "Hello anon!".to_string()
+    }
+}