Add checking for scalafmt conformance

.github/workflows/ci.yaml

@@ -28,6 +28,12 @@ jobs:
         with:
           sparse-checkout: 'api'
       - run: "find ./api -maxdepth 1 -mindepth 1 -exec mv {} . \\; && rm -r ./api"
+      - name: Check for scalafmt conformance
+        run: |
+          curl -fL "https://github.com/VirtusLab/coursier-m1/releases/latest/download/cs-aarch64-pc-linux.gz" | gzip -d > cs
+          chmod +x cs
+          cs install scalafmt
+          ./cs scalafmt --check
       - name: Setup JDK
         uses: actions/setup-java@v3
         with: