chore: add cache for element

Author: phodal

.github/workflows/ci.yml

@@ -41,6 +41,8 @@ jobs:
           command: install
           args: cargo-ndk
 
+      - uses: Swatinem/rust-cache@v2
+
       - name: setup build targets
         run: rustup target add aarch64-linux-android armv7-linux-androideabi i686-linux-android x86_64-linux-android aarch64-apple-ios x86_64-apple-ios