enabled wasmtime built in caching

src/backend/wasmtime.rs

@@ -13,12 +13,14 @@ type Linker = wasmtime::Linker<ScriptAbiImpl>;
 pub struct WasmtimeBackend {
     engine: wasmtime::Engine,
 }
+
 impl WasmtimeBackend {
     pub fn new() -> anyhow::Result<Self> {
         let mut config = wasmtime::Config::new();
         config.wasm_simd(true);
         config.wasm_bulk_memory(true);
         config.cranelift_opt_level(wasmtime::OptLevel::Speed);
+        config.cache_config_load_default()?;
 
         let engine = wasmtime::Engine::new(&config)?;
 
@@ -26,7 +28,9 @@ impl WasmtimeBackend {
     }
 }
 
+
 impl Backend for WasmtimeBackend {
+
     fn load_module(&self, module: &[u8]) -> anyhow::Result<Arc<dyn Instance>> {
         let module = wasmtime::Module::new(&self.engine, module)?;
         let abi = ScriptAbiImpl::default();