🚀 Feature: Add support for GitHub Discussions

Feature Description

Add support for welcoming first-time contributors who create discussions, similar to how the action currently handles issues and pull requests. This would allow maintainers to provide a welcoming message to users who start their first discussion in a repository.

Use Case

Many repositories use GitHub Discussions as a community platform for questions, ideas, and announcements. Being able to welcome new community members when they start their first discussion would help create a more welcoming environment and guide them towards productive participation.

Currently, the action supports:

First issue (issue-message)
First pull request (pr-message)

The proposal is to add:

First discussion (discussion-message)

Implementation Details

The implementation could follow the same pattern as issues and PRs:

Add a new input parameter discussion-message to the action
Add discussion event support in the action trigger
Update the action to handle the discussion event type
Document the new feature in the README

Example usage would look like:

- name: First interaction
  uses: actions/first-interaction@v1
  with:
    repo-token: ${{ secrets.GITHUB_TOKEN }}
    discussion-message: |
      Welcome to our community discussions! ...

Motivation

GitHub Discussions has become an integral part of many open source communities. The ability to welcome new discussion participants would:

Create a more inclusive community
Help guide new users towards productive discussions
Maintain consistency in how we welcome all types of first-time contributors

Alternatives Considered

Currently, maintainers need to create custom workflows using the GitHub API to achieve this functionality, which is more complex and requires additional maintenance compared to using this established action.

I'd be happy to contribute to implementing this feature if desired! 🙌

actions / first-interaction