remove region from cloudfront url

Author: lukqw

.github/workflows/preview.yml

@@ -29,7 +29,7 @@ jobs:
             make bootstrap-frontend
             make deploy-frontend
             distributionId=$(awslocal cloudfront list-distributions | jq -r '.DistributionList.Items[0].Id')
-            echo "PREVIEW_URL=$AWS_ENDPOINT_URL/cloudfront/$AWS_DEFAULT_REGION/$distributionId/" >> $GITHUB_ENV
+            echo "PREVIEW_URL=$AWS_ENDPOINT_URL/cloudfront/$distributionId/" >> $GITHUB_ENV
 
       - name: Finalize PR comment
         uses: LocalStack/setup-localstack/finish@pass-url-to-finish-step