fix CodeQL workflow by installing protobuf-c

Author: lavarou

.github/workflows/codeql.yml

@@ -52,6 +52,12 @@ jobs:
     # ℹ️ Command-line programs to run using the OS shell.
     # 📚 See https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstepsrun
 
+    - name: Provision agent's build dependencies
+      if: ${{ matrix.language == 'c-cpp' }}
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y libprotobuf-c-dev protobuf-c-compiler
+
     - name: Build
       run: |
         make ${{ matrix.language == 'go' && 'daemon' || 'agent' }}