feat: add protoc setup

Author: lherman-cs

.github/workflows/rust.yml

@@ -16,6 +16,8 @@ jobs:
     - uses: actions/checkout@v4
       with:
         submodules: 'recursive'
+    - name: Install Protoc
+      uses: arduino/setup-protoc@v3
     - name: Build
       run: cargo build --verbose
     - name: Run tests