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[fix] #211 - SubtaskCompletion 연관관계에 OnDelete(CASCADE) 추가 #116

	name: PR 머지 완료 Slack 알림

	on:
	pull_request:
	types: [closed]

	jobs:
	notify:
	if: github.event.pull_request.merged == true
	runs-on: ubuntu-latest

	steps:
	- name: Slack 머지 완료 알림 전송
	uses: actions/github-script@v8
	env:
	SLACK_PR_WEBHOOK_URL: ${{ secrets.SLACK_PR_WEBHOOK_URL }}
	with:
	script: \|
	const pr = context.payload.pull_request;
	const webhookUrl = process.env.SLACK_PR_WEBHOOK_URL;

	if (!webhookUrl) {
	throw new Error("Repository Secret 'SLACK_PR_WEBHOOK_URL'이 없습니다.");
	}

	const text = [
	"<!channel> PR이 머지되었어요!",
	`<${pr.html_url}\|PR 보러가기>`
	].join("\n");

	const slackResponse = await fetch(webhookUrl, {
	method: "POST",
	headers: {
	"Content-Type": "application/json; charset=utf-8"
	},
	body: JSON.stringify({ text }),
	signal: AbortSignal.timeout(10_000)
	});

	if (!slackResponse.ok) {
	throw new Error("Slack 알림 전송에 실패했습니다.");
	}