fixed workflow build

Author: Samuel1-ona

.github/workflows/rust.yml

@@ -35,6 +35,9 @@ jobs:
           target/
         key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
 
+    - name: Install protobuf-compiler
+      run: sudo apt-get update && sudo apt-get install -y protobuf-compiler
+    
     - name: Build
       run: cargo build --verbose