put the AWS_DEFAULTS_MODE inside env section for test

Author: Anirav Kareddy

.github/workflows/build.yml

@@ -45,8 +45,9 @@ jobs:
         shell: bash
 
       - name: Test
+        env:
+          AWS_DEFAULTS_MODE: mobile
         run: |
-          export AWS_DEFAULTS_MODE=mobile
           export AWS_S3EC_TEST_ALT_KMS_KEY_ARN=arn:aws:kms:${{ vars.CI_AWS_REGION }}:${{ secrets.CI_AWS_ACCOUNT_ID }}:key/${{ vars.CI_ALT_KMS_KEY_ID }}
           export AWS_S3EC_TEST_ALT_ROLE_ARN=arn:aws:iam::${{ secrets.CI_AWS_ACCOUNT_ID }}:role/service-role/${{ vars.CI_ALT_ROLE }}
           export AWS_S3EC_TEST_BUCKET=${{ vars.CI_S3_BUCKET }}