ci: Add Rust dependency caching for wasm-miniscript package

Ticket: BTC-0
Co-authored-by: aider <[email protected]>

Author: OttoAllmendinger

.github/workflows/ci.yml

@@ -30,6 +30,12 @@ jobs:
         with:
           toolchain: nightly
 
+      - name: Cache Rust dependencies
+        uses: Swatinem/rust-cache@v2
+        with:
+          workspaces: "packages/wasm-miniscript"
+          cache-on-failure: true
+
       - name: Setup node ${{ matrix.node-version }}
         uses: actions/setup-node@v3
         with: