Potential fix for code scanning alert no. 1: Workflow does not contain permissions

[DmitriyMusatkin]

Potential fix for https://github.com/awslabs/aws-c-s3/security/code-scanning/1

To fix the issue, we need to add a permissions block to the workflow. This block should specify the least privileges required for the workflow to function correctly. Based on the functionality of the aws-actions/closed-issue-message action, the workflow likely only needs contents: read and issues: write permissions. These permissions allow the workflow to read repository contents and post comments on issues, which aligns with its intended purpose.

The permissions block can be added at the root level of the workflow to apply to all jobs, or specifically to the auto_comment job. In this case, adding it at the root level is sufficient and ensures clarity.

---

Suggested fixes powered by Copilot Autofix. Review carefully before merging.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.75%. Comparing base (36e2c37) to head (e891f24).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #540      +/-   ##
==========================================
- Coverage   88.78%   88.75%   -0.03%     
==========================================
  Files          22       22              
  Lines        6722     6722              
==========================================
- Hits         5968     5966       -2     
- Misses        754      756       +2     

see 1 file with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.