fix: handle GPG sign git config for initial commit (#5823)

Fixes #5818

Author: spenserblack

packages/@vue/cli/lib/Creator.js

@@ -248,12 +248,22 @@ module.exports = class Creator extends EventEmitter {
 
     // commit initial state
     let gitCommitFailed = false
+    let gpgSign = false
     if (shouldInitGit) {
       await run('git add -A')
       if (isTestOrDebug) {
         await run('git', ['config', 'user.name', 'test'])
         await run('git', ['config', 'user.email', '[email protected]'])
+        await run('git', ['config', 'commit.gpgSign', 'false'])
       }
+      gpgSign = await (async () => {
+        const { stdout: gpgSignConfig } = await run('git', [
+          'config',
+          '--get',
+          'commit.gpgSign'
+        ])
+        return gpgSignConfig === 'true'
+      })()
       const msg = typeof cliOptions.git === 'string' ? cliOptions.git : 'init'
       try {
         await run('git', ['commit', '-m', msg, '--no-verify'])
@@ -277,7 +287,7 @@ module.exports = class Creator extends EventEmitter {
 
     if (gitCommitFailed) {
       warn(
-        `Skipped git commit due to missing username and email in git config.\n` +
+        `Skipped git commit due to missing username and email in git config${gpgSign ? ' or failed to sign commit' : ''}.\n` +
         `You will need to perform the initial commit yourself.\n`
       )
     }