ci(github-actions): add workshop-engine to CI matrix strategy

Expand CI to run on workshop-engine crate alongside workshop-baker using
a matrix strategy to avoid job duplication.

.github/workflows/ci.yml

@@ -5,27 +5,33 @@ on:
     branches: [ master, main ]
     paths:
       - 'workshop-baker/**'
+      - 'workshop-engine/**'
       - '.github/workflows/ci.yml'
   pull_request:
     branches: [ master, main ]
     paths:
       - 'workshop-baker/**'
+      - 'workshop-engine/**'
       - '.github/workflows/ci.yml'
 
 env:
   CARGO_TERM_COLOR: always
 
 jobs:
-  check-and-lint:
+  ci:
-    name: Check & Lint
+    name: ${{ matrix.crate }}
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        crate: [workshop-baker, workshop-engine]
+
     defaults:
       run:
-        working-directory: ./workshop-baker
+        working-directory: ./${{ matrix.crate }}
 
     steps:
-    - name: Checkout code
+    - uses: actions/checkout@v4
-      uses: actions/checkout@v4
 
     - name: Install Rust toolchain
       uses: dtolnay/rust-toolchain@stable
@@ -38,19 +44,19 @@ jobs:
         path: |
           ~/.cargo/registry
           ~/.cargo/git
-          target
+          ${{ matrix.crate }}/target
-        key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+        key: ${{ runner.os }}-cargo-${{ matrix.crate }}-${{ hashFiles(format('{0}/Cargo.lock', matrix.crate)) }}
         restore-keys: |
-          ${{ runner.os }}-cargo-
+          ${{ runner.os }}-cargo-${{ matrix.crate }}-
+
+    - name: Check compilation
+      run: cargo check --all-features
+
+    - name: Run tests
+      run: cargo test --all-features
 
     - name: Check formatting
       run: cargo fmt -- --check
 
-    - name: Check code (cargo check)
-      run: cargo check --all-features
-
     - name: Run Clippy lints
       run: cargo clippy --all-features -- -D warnings
-
-    - name: Run tests
-      run: cargo test --all-features