infra: actions: add check-format job

.gitea/workflows/gentoo-utils.yml

@@ -94,3 +94,16 @@ jobs:
           meson compile -C build
           ninja test -C build
 
+  check-format:
+    runs-on: brutalisk
+    needs: [build-oci-image]
+    container:
+      image: ${{ vars.REGISTRY_URL }}/${{ gitea.repository }}:${{ needs.build-oci-image.outputs.image_tag }}
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v5
+
+      - name: Check Formatting
+        run: |
+          meson setup -Dfuzz=enabled -Dtests=enabled -Dbuildtype=debugoptimized -Ddocs=enabled build
+          ninja rustfmt -C build