chore: add caching setup for CI workflow

.github/workflows/ci.yml

@@ -89,6 +89,9 @@ jobs:
         with:
           components: clippy
 
+      - name: Set up cache
+        uses: Swatinem/rust-cache@v2
+
       - name: Run clippy
         run: cargo +nightly clippy
 
@@ -104,6 +107,9 @@ jobs:
         with:
           components: rustfmt
 
+      - name: Set up cache
+        uses: Swatinem/rust-cache@v2
+
       - name: Run rustfmt
         run: cargo +nightly fmt --all -- --check
 
@@ -118,6 +124,9 @@ jobs:
       - name: Set up Rust
         uses: dtolnay/rust-toolchain@stable
 
+      - name: Set up cache
+        uses: Swatinem/rust-cache@v2
+
       - name: Run build
         run: cargo build
 
@@ -136,5 +145,8 @@ jobs:
       - name: Set up Rust
         uses: dtolnay/rust-toolchain@stable
 
+      - name: Set up cache
+        uses: Swatinem/rust-cache@v2
+
       - name: Run check
         run: cargo check --examples