fix: reformat ec2 cleanup commands (#1267)

Co-authored-by: Sam Rose <[email protected]>

Author: samrose

.github/workflows/testinfra-nix.yml

@@ -65,12 +65,12 @@ jobs:
       - name: Cleanup resources on build cancellation
         if: ${{ cancelled() }}
         run: |
-          aws ec2 --region ap-southeast-1 describe-instances --filters "Name=tag:packerExecutionId,Values=${GITHUB_RUN_ID}" --query "Reservations[].Instances[].InstanceId" --output text | xargs -n 1 -I {} aws ec2 terminate-instances --region ap-southeast-1 --instance-ids {}
-   
-      - name: Cleanup resources on build cancellation
+          aws ec2 --region ap-southeast-1 describe-instances --filters "Name=tag:packerExecutionId,Values=${GITHUB_RUN_ID}" --query "Reservations[].Instances[].InstanceId" --output text | xargs -r aws ec2 terminate-instances --region ap-southeast-1 --instance-ids
+
+      - name: Cleanup resources after build
         if: ${{ always() }}
         run: |
-          aws ec2 --region ap-southeast-1 describe-instances --filters "Name=tag:testinfra-run-id,Values=${GITHUB_RUN_ID}" --query "Reservations[].Instances[].InstanceId" --output text | xargs -n 1 -I {} aws ec2 terminate-instances --region ap-southeast-1 --instance-ids {} || true
+          aws ec2 --region ap-southeast-1 describe-instances --filters "Name=tag:testinfra-run-id,Values=${GITHUB_RUN_ID}" --query "Reservations[].Instances[].InstanceId" --output text | xargs -r aws ec2 terminate-instances --region ap-southeast-1 --instance-ids || true
 
       - name: Cleanup AMIs
         if: always()