Add ninja

Author: alexcrichton

.github/workflows/main.yml

@@ -230,6 +230,9 @@ jobs:
         uses: bytecodealliance/actions/wasmtime/setup@v1
         with:
           version: "18.0.2"
+      - name: Install ninja
+        run: sudo apt-get install -y ninja-build
+        if: runner.os == 'Linux'
       - uses: actions/download-artifact@v4
         with:
           name: dist-x86_64-linux