✨ feat: add RUSTFLAGS for wasm example build

Author: foxzool

.github/workflows/deploy-page.yaml

@@ -43,7 +43,7 @@ jobs:
         run: rustup target add wasm32-unknown-unknown
 
       - name: Build Example
-        run: cargo build --release --target wasm32-unknown-unknown --example window
+        run:  RUSTFLAGS='--cfg getrandom_backend="wasm_js"'  cargo build --release --target wasm32-unknown-unknown --example window
 
       - name: Generate wasm bindings
         run: |