ci: Add Rust workspace cache

.github/workflows/build.yml

@@ -26,6 +26,8 @@ jobs:
         uses: dtolnay/rust-toolchain@stable
         with:
           components: clippy
+      - name: Cache Rust workspace
+        uses: Swatinem/rust-cache@v2
       - name: Cargo check
         run: cargo check --all-features --all-targets
       - name: Cargo clippy
@@ -75,6 +77,8 @@ jobs:
         uses: actions/checkout@v4
       - name: Setup Rust toolchain
         uses: dtolnay/rust-toolchain@stable
+      - name: Cache Rust workspace
+        uses: Swatinem/rust-cache@v2
       - name: Cargo test
         run: cargo test --release --all-features
 
@@ -138,6 +142,10 @@ jobs:
         uses: dtolnay/rust-toolchain@stable
         with:
           targets: ${{ matrix.target }}
+      - name: Cache Rust workspace
+        uses: Swatinem/rust-cache@v2
+        with:
+          key: ${{ matrix.target }}
       - name: Cargo build
         run: >
           cargo ${{ matrix.build }} --profile ${{ env.BUILD_PROFILE }} --target ${{ matrix.target }}