Add REPOST_TO_THREAD_AND_DELETE action for error-log-to-thread-and-delete reaction

[Copilot]

The error-log-to-thread-please reaction posts a reminder message but leaves the original error log in the channel. This adds a new action that reposts the original message to its thread, then deletes it from the channel to save space.

Changes

• New action handler: REPOST_TO_THREAD_AND_DELETE in lambda_function.py

  • Retrieves original message content
  • Posts configurable message template to thread with original message quoted
  • Deletes message from channel (preserved in thread via repost)
  • Handles placeholders with channel-specific values and defaults
  • Escapes curly braces in user content to avoid format string conflicts

• New reaction config: error-log-to-thread-and-delete in config.yaml

  • Configurable response template with {user_message}, {link}, {user}, {channel} placeholders
  • Channel-specific links for course-related channels with default fallback

• Tests: 6 new test cases covering nominal flow and edge cases (missing message/user, placeholder matching failure, curly braces in content)

• Documentation: Updated README with new action type and reaction description

Example Configuration

- reaction: error-log-to-thread-and-delete
  type: REPOST_TO_THREAD_AND_DELETE
  placeholders:
    link:
      course-ml-zoomcamp: https://github.com/.../asking-questions.md
      default: https://datatalks.club/slack/guidelines.html
  message: |
    Removing the message from the channel to save space. Please move the error log to the thread.
    
    Follow <{link}|these recommendations> to make it easier to help you.
    
    Here's the original message:
    
    > {user_message}

The original error-log-to-thread-please reaction remains unchanged for backward compatibility.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• slack.com
  • Triggering command: /usr/bin/python python test.py (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>New action for error-log-to-thread-please</issue_title>
<issue_description>Right now it simply responds to the thread. what I want to do instead:

• Repost the original message (the one that started the thread) to the thread with the message "removing the message from the channel to save space. Please ... (use the original message from current implementation) Here's the original message: >"
• Delete the message from the channel (but keep ones in the thread)

We will need to create a new action for that and new configuration. COnfigurable part: the response template </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes New action for error-log-to-thread-please #15

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