Update package-accounting-service.yaml

.github/workflows/package-accounting-service.yaml

@@ -41,6 +41,8 @@ jobs:
           msg: ${{ matrix.service }}
       - name: Checkout
         uses: actions/checkout@v2
+        with:
+          ref: contoso-health
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v1
       - name: Login to GitHub Container Registry