Cache 32 bit dependencies

Author: molpopgen

.github/workflows/test32bit.yml

@@ -28,6 +28,7 @@ jobs:
         with:
           toolchain: ${{ matrix.rust }}
           override: true
+      - uses: Swatinem/rust-cache@v1
       - name: Install Linux tooling for 32 bit builds
         run: |
           sudo apt-get update -y