add gitea sig header check, add Json errors, begin AppState

src/state.rs

@@ -0,0 +1,10 @@
+use std::sync::Arc;
+use tokio::sync::Mutex;
+
+use crate::{bot::Bot, env::EnvConfig};
+
+#[derive(Clone)]
+pub struct AppState {
+    pub bot: Arc<Mutex<Bot>>,
+    pub config: EnvConfig,
+}