update how we connect to s3 in ci

Author: isabelizimm

.github/workflows/ci.yml

@@ -60,15 +60,17 @@ jobs:
           project_id: siuba-tests
           service_account_key: ${{ secrets.GCP_SA_KEY }}
           export_default_credentials: true
-
+      - name: Configure AWS credentials
+        id: creds
+        uses: aws-actions/configure-aws-credentials@master
+        with:
+          role-to-assume: ${{ secrets.AWS_ROLE_TO_ASSUME }}
+          AWS_REGION: "us-east-1"
       - name: Run tests
         shell: bash
         run: |
           pytest pins -m 'not fs_rsc and not skip_on_github' $PYTEST_OPTS
         env:
-          AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
-          AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
-          AWS_REGION: "us-east-1"
           AZURE_STORAGE_ACCOUNT_NAME: ${{ secrets.AZURE_STORAGE_ACCOUNT_NAME }}
           AZURE_STORAGE_ACCOUNT_KEY: ${{ secrets.AZURE_STORAGE_ACCOUNT_KEY }}
           DATABRICKS_HOST: ${{ secrets.DATABRICKS_HOST }}