Fix checkout

.github/workflows/push.yaml

@@ -14,6 +14,7 @@ jobs:
     steps:
     - uses: actions/checkout@v2
       with:
+        ref: 'parser'
         submodules: 'recursive'
     - name: Set up Python
       uses: actions/setup-python@v2
@@ -23,11 +24,7 @@ jobs:
       run: python main.py
     - name: Update submodules
       run: |
-        cd data_export
-        git fetch origin
-        git checkout -b export origin/export
-        cd ..
-        git submodule init
+        git submodule update --init --recursive
         git submodule update --remote
     - name: Push changes
       run: |