chore(ci): replace Protoc setup with protobuf-compiler installation in GitHub Actions

Author: imikushin

.github/workflows/build-image.yml

@@ -32,11 +32,8 @@ jobs:
         with:
           cache-key: ${{env.MY_RUNNER}}
 
-      - name: Install Protoc
-        uses: arduino/setup-protoc@v3
-        with:
-          version: '34.x'
-          repo-token: ${{ secrets.GITHUB_TOKEN }}   # Avoids GitHub API rate limiting
+      - name: Install protobuf-compiler (system package)
+        run: sudo apt-get update && sudo apt-get install -y protobuf-compiler
 
       # Build with the prover feature
       - name: Build the application