Use Nightly + Cranelift for dev, only fail on warnings in CI (#4388)

* Switch to nightly + cranelift

* Fail on warnings only in CI

* Fix check errors

* Don't use mold on Linux to fix CI

* Pin nightly toolchain and add default rustup components

* Fix another CI thing

* PR comment

packages/app-lib/src/state/cache.rs

@@ -519,11 +519,14 @@ impl CacheValue {
     }
 }
 
-#[derive(Deserialize, Serialize, PartialEq, Eq, Debug, Copy, Clone)]
+#[derive(
+    Deserialize, Serialize, PartialEq, Eq, Debug, Copy, Clone, Default,
+)]
 #[serde(rename_all = "snake_case")]
 pub enum CacheBehaviour {
     /// Serve expired data. If fetch fails / launcher is offline, errors are ignored
     /// and expired data is served
+    #[default]
     StaleWhileRevalidateSkipOffline,
     // Serve expired data, revalidate in background
     StaleWhileRevalidate,
@@ -533,12 +536,6 @@ pub enum CacheBehaviour {
     Bypass,
 }
 
-impl Default for CacheBehaviour {
-    fn default() -> Self {
-        Self::StaleWhileRevalidateSkipOffline
-    }
-}
-
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct CachedEntry {
     id: String,