CI: Automatically check formatting

.gitea/workflows/build.yaml

@@ -11,11 +11,13 @@ jobs:
       - name: Download dependencies
         run: |
           apt update
-          apt install -y cmake ninja-build nasm genext2fs qemu-system build-essential wget git
+          apt install -y cmake ninja-build nasm genext2fs qemu-system build-essential wget git clang-format
       - name: Set up the toolchain
         run: |
           wget https://pub.cloudapio.eu/luna/toolchains/ci-toolchain-arm64.tar.gz --quiet
           tar xf ci-toolchain-arm64.tar.gz
           rm ci-toolchain-arm64.tar.gz
+      - name: Check formatting
+        run: tools/check-formatting.sh
       - name: Build and run tests
         run: tools/run-tests.sh