add protobuf-compiler dependency

Author: x3c41a

.github/workflows/smoldot-test.yml

@@ -27,6 +27,11 @@ jobs:
       - name: Install Rust toolchain
         uses: dtolnay/rust-toolchain@stable
 
+      - name: Install system dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y protobuf-compiler
+
       - name: Rust cache
         uses: Swatinem/rust-cache@v2
         with: