ci: split into lint + build matrix with warnings-as-errors

.github/workflows/ci.yml

@@ -7,28 +7,64 @@ on:
     branches: [master]
   workflow_dispatch:
 
+concurrency:
+  group: ci-${{ github.head_ref || github.ref }}
+  cancel-in-progress: true
+
 jobs:
-  test:
+  lint:
     runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: |
+            8.0.x
+            9.0.x
+            10.0.x
 
+      - name: Restore tools
+        run: dotnet tool restore
+
+      - name: Check formatting
+        run: dotnet csharpier check .
+
+      - name: Restore
+        run: dotnet restore
+
+      - name: Build (warnings as errors)
+        run: dotnet build -c Release --no-restore -warnaserror
+
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        framework: [net8.0, net9.0, net10.0]
     steps:
       - uses: actions/checkout@v4
 
       - name: Setup .NET
         uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: '10.0.x'
+          dotnet-version: |
+            8.0.x
+            9.0.x
+            10.0.x
 
       - name: Restore
         run: dotnet restore
 
-      - name: Build
-        run: dotnet build -c Release --no-restore
+      - name: Build (${{ matrix.framework }})
+        run: dotnet build -c Release --no-restore --framework ${{ matrix.framework }}
 
-      - name: Test
-        run: dotnet test -c Release --no-build --verbosity normal --collect:"XPlat Code Coverage"
+      - name: Test (${{ matrix.framework }})
+        run: dotnet test -c Release --no-build --framework ${{ matrix.framework }} --collect:"XPlat Code Coverage"
 
       - name: Upload coverage to Codecov
+        if: matrix.framework == 'net10.0'
         uses: codecov/codecov-action@v5
         with:
           token: ${{ secrets.CODECOV_TOKEN }}