Move checkout first which will reset the workspace. (#6020)

* Move checkout first which will reset the workspace.

Author: granluo

.github/workflows/zip.yml

@@ -73,12 +73,12 @@ jobs:
       SDK: "Config"
     runs-on: macOS-latest
     steps:
+    - uses: actions/checkout@v2
     - name: Get framework zip file
       uses: actions/download-artifact@v1
       with:
         name: Firebase-actions-dir
-    - uses: actions/checkout@v2
-    - name: Pull zip from GCS
+    - name: Unzip frameworks
       run: |
         unzip "${GITHUB_WORKSPACE}/${FRAMEWORK_ZIP}" -d "${OUTPUT_DIR}"
         find "${OUTPUT_DIR}" -name "*.zip" -maxdepth 3 -exec unzip -d "${OUTPUT_DIR}" {} +