feat: improve contribution flow via issues #34

	name: Comment preview link on content PRs

	on:
	pull_request:
	types: [opened, synchronize]
	branches: [main]

	jobs:
	preview-comment:
	runs-on: ubuntu-latest
	permissions:
	pull-requests: write
	steps:
	- name: Check for content file and comment preview link
	uses: actions/github-script@v7
	with:
	script: \|
	const { data: files } = await github.rest.pulls.listFiles({
	...context.repo,
	pull_number: context.payload.pull_request.number,
	});

	const hasContentFile = files.some(f =>
	/^src\/content\/(apps\|mechanisms\|research\|case-studies\|campaigns)\/.+\.md$/.test(f.filename)
	);

	if (!hasContentFile) return;

	const pr = context.payload.pull_request.number;
	const previewUrl = `https://gitcoin.co/preview?pr=${pr}`;

	// Avoid duplicate comments on synchronize
	const { data: comments } = await github.rest.issues.listComments({
	...context.repo,
	issue_number: pr,
	});
	const alreadyCommented = comments.some(c =>
	c.body?.includes('/preview?pr=')
	);
	if (alreadyCommented) return;

	await github.rest.issues.createComment({
	...context.repo,
	issue_number: pr,
	body: `Preview: ${previewUrl}`,
	});

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