chore: 오래된 브랜치 제거하는 workflow 추가

This workflow automatically deletes branches that haven't had any commits in the last 7 days, excluding 'main' and 'dev'. It runs on a schedule every Friday and can also be triggered manually.

Author: bebusl

.github/workflows/cleanup-branch.yml

@@ -0,0 +1,41 @@
+on:
+  schedule:
+  - cron: "0 0 * * 5"
+  workflow_dispatch:
+
+jobs:
+  cleanup:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Delete old branches
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const owner = context.repo.owner;
+            const repo = context.repo.repo;
+            const days = 7;
+            const cutoff = new Date(Date.now() - days*24*60*60*1000);
+
+            const branches = await github.paginate(github.reset.repose.listBranches, { owner, repo });
+
+            for (const branch of branches){
+              if(branch.name === 'main' || branch.name ==='dev') continue;
+
+              const commits = await github.rest.repos.listCommits({
+                owner,
+                repo,
+                sha: branch.name,
+                per_page: 1
+              })
+
+              const lastCommitDate = new Date(commits.data[0].commit.committer.date);
+
+              if(lastCommitDate < cutoff ) {
+                console.log(`Deleting ${branch.name}`);
+                await github.rest.git.deleteRef({
+                  owner,
+                  repo,
+                  ref: `heads/${branch.name}`
+                })
+              }
+            }