github action support for gRPC

.github/workflows/go.yml

@@ -14,15 +14,26 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+      - uses: actions/checkout@v4
 
-    - name: Set up Go
-      uses: actions/setup-go@v5
-      with:
-        go-version: '1.23'
+      - name: Install Protoc
+        uses: arduino/setup-protoc@v3
 
-    - name: Build
-      run: go build -v ./...
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.23'
 
-    - name: Test
-      run: go test -v ./...
+      - name: gRPC gen
+        run: |
+          go install google.golang.org/protobuf/cmd/protoc-gen-go@latest
+          go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest
+          protoc --go_out=. --go_opt=paths=source_relative \
+             --go-grpc_out=. --go-grpc_opt=paths=source_relative \
+            internal/pb/billy.proto
+
+      - name: Build
+        run: go build -v ./...
+
+      - name: Test
+        run: go test -v ./...