refactor: 改用 execSync

Dockerfile

@@ -1,9 +1,9 @@
-FROM node:20-slim
+FROM alpine
 
-# force rebuild to ensure git is installed
-RUN apt-get update && apt-get install -y --no-install-recommends \
-    git \
-    && rm -rf /var/lib/apt/lists/*
+RUN apk add --no-cache bash nodejs npm git \
+    && node --version \
+    && npm --version \
+    && git --version
 
 WORKDIR /action
 

app/git.js

@@ -1,17 +1,16 @@
-import { spawnSync } from 'child_process';
+import { execSync } from 'child_process';
 import path from 'path';
 import { GITEA_SERVER_URL, GITEA_REPOSITORY, GITEA_TOKEN, PR_HEAD_BRANCH, FINDINGS_PATH } from './config.js';
 
 function git(args, cwd) {
-  const result = spawnSync('git', args, { cwd, encoding: 'utf8' });
-  if (result.error) throw result.error;
-  if (result.status !== 0) throw new Error((result.stderr || result.stdout || '').trim());
-  return (result.stdout || '').trim();
+  return execSync(`git ${args.map(a => `'${a.replace(/'/g, "'\\''")}'`).join(' ')}`, { cwd, encoding: 'utf8' }).trim();
 }
 
 export async function commitAndPush(workspace) {
   const repoDir = path.join(workspace, GITEA_REPOSITORY);
-  const remoteUrl = GITEA_SERVER_URL.replace(/\/$/, '').replace('https://', `https://${GITEA_TOKEN}@`).replace('http://', `http://${GITEA_TOKEN}@`) + `/${GITEA_REPOSITORY}.git`;
+  const remoteUrl = GITEA_SERVER_URL.replace(/\/$/, '')
+    .replace('https://', `https://${GITEA_TOKEN}@`)
+    .replace('http://', `http://${GITEA_TOKEN}@`) + `/${GITEA_REPOSITORY}.git`;
 
   try {
     git(['config', 'user.email', 'ai-review[bot]@gitea'], repoDir);