ci: conventional commits aws#5494

Problem
-------
PRs created by the automerge bot are rejected. Also when merging feature
branches to master.

Solution
--------
Allow "Merge" pull requests.

Author: justinmk3

.github/workflows/lintcommit.js

@@ -71,6 +71,10 @@ function validateTitle(title) {
     const parts = title.split(':')
     const subject = parts.slice(1).join(':').trim()
 
+    if (title.startsWith('Merge')) {
+        return undefined
+    }
+
     if (parts.length < 2) {
         return 'missing colon (:) char'
     }
@@ -172,6 +176,7 @@ function _test() {
         'style: format code': undefined,
         'test: add new tests': undefined,
         'types: add type definitions': undefined,
+        'Merge staging into feature/lambda-get-started': undefined,
     }
 
     let passed = 0

.github/workflows/node.js.yml

@@ -32,7 +32,7 @@ jobs:
             - uses: actions/setup-node@v4
               with:
                   node-version: '20'
-            - name: Check PR title and commit message
+            - name: Check PR title
               run: |
                   node "$GITHUB_WORKSPACE/.github/workflows/lintcommit.js"