fix: run stacklit action on push to master, not PRs

[thegdsks]

Summary

• Change stacklit-index workflow from check mode on PRs to auto-commit mode on push to master
• Check mode on PRs breaks because contributors don't regenerate the index before pushing

What changes

• Trigger: pull_request → push to master
• Mode: check → auto-commit
• Added permissions: contents: write for auto-commit

[Copilot]

Pull request overview

This PR updates the Stacklit index GitHub Actions workflow so the index is regenerated and committed automatically on pushes to master, rather than running in “check” mode on pull requests.

Changes:

• Switch workflow trigger from pull_request to push on master.
• Change Stacklit action mode from check to auto-commit.
• Grant contents: write permission to allow committing updates back to the repo.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

Because this workflow auto-commits, the resulting push to the same branch will re-trigger the workflow (at least once). To avoid redundant runs (and prevent potential loops if generated files vary), add paths-ignore for the generated outputs (e.g., stacklit.json and DEPENDENCIES.md) and/or guard with an if: that skips when the actor is the bot doing the commit.

Suggested change

	branches: [master]
	jobs:
	stacklit:
	branches: [master]
	paths-ignore:
	- stacklit.json
	- DEPENDENCIES.md
	jobs:
	stacklit:
	if: github.actor != 'github-actions[bot]'

[Copilot]

This workflow triggers only on master, but other workflows in this repo run on both master and main. If main is still used (or becomes the default branch), this index updater will stop running; consider including both branches ([master, main]) for consistency.

Suggested change

	branches: [master]
	branches: [master, main]