Consider rust-specific cache action

[Mike Boutin]

Instead of manual cache setup, consider a rust-specific action like https://github.com/Swatinem/rust-cache. What do other crates do for caching?

uom/.github/workflows/ci-full-test-suite.yml

Lines 19 to 30 in d4f08de

       # Cache based on OS/compiler. 
       - name: Extract cache 
         uses: actions/cache@v3 
         with: 
           path: | 
             ~/.cargo 
             !~/.cargo/registry/index 
             !~/.cargo/git/checkouts 
             target 
             !target/tests 
             !target/examples 
           key: ${{ runner.os }}-${{ steps.install-rust.outputs.cachekey }} 

[Adam Reichold]

What do other crates do for caching?

As examples, PyO3 and Tantivy just use Swatinem's rust-cache.