Write out service_account.json until we understand what's happening (#…

…688)

* v1

* Move everything to Python 3.10

* ugh

* Don't overwrite prod credentials

* Go back to old way, force write key

.github/workflows/deploy.yml

@@ -25,7 +25,10 @@ jobs:
         with:
           credentials_json: ${{secrets.GCP_SERVICE_ACCOUNT}}
 
-      - name: Verify tests pass
+      - name: Export key
+        run: echo '${{secrets.GCP_SERVICE_ACCOUNT}}' > service_account.json
+
+      - name: Verify tests still pass
         run: python main_test.py
 
       - name: Upload master_schedule.json