Add code quality scanning

Author: casibbald

.github/workflows/scan.yml

@@ -56,15 +56,48 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
 
+      # Set up Rust
+      - name: Set up Rust
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: nightly
+          override: true
+
       - name: Install cargo-llvm-cov
         uses: taiki-e/install-action@cargo-llvm-cov
 
       - name: Install Clippy
         run: rustup component add clippy
 
+      # Cache Cargo dependencies
+      - name: Cache Cargo registry
+        uses: actions/cache@v3
+        with:
+          path: ~/.cargo/registry
+          key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-registry-
+
+      - name: Cache Cargo index
+        uses: actions/cache@v3
+        with:
+          path: ~/.cargo/git
+          key: ${{ runner.os }}-cargo-index-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-index-
+
+      - name: Cache target directory
+        uses: actions/cache@v3
+        with:
+          path: target
+          key: ${{ runner.os }}-cargo-target-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-target-
+
       - name: Install cargo-sonar and run Clippy
         run: |
-          cargo install cargo-sonar
+          cargo install cargo-sonar 
           cargo clippy --message-format json > my-clippy-report.json
           cargo sonar --issues clippy --clippy-path my-clippy-report.json