ci: editing PR description re-triggers all GitHub Actions

Problem:
The `lint-commits` job runs whenever the PR description is edited, which
then re-runs all the other GHA jobs. This is because it listens to the
`edited` event (6dcbfc7)

Solution:
Make the `lint-commits` job conditional on `github.event.changes.title`.

Author: justinmk3

.github/workflows/node.js.yml

@@ -9,7 +9,8 @@ on:
     pull_request:
         branches: [master, feature/*, staging]
         # Default = opened + synchronize + reopened.
-        # We also want "edited" so that lint-commits runs when PR title is updated.
+        # We also want `edited` so that `lint-commits` runs when PR title is updated (see
+        # `github.event.changes.title` condition below).
         # https://docs.github.com/en/actions/writing-workflows/choosing-when-your-workflow-runs/events-that-trigger-workflows#pull_request
         types:
             - edited
@@ -24,6 +25,8 @@ concurrency:
 
 jobs:
     lint-commits:
+        # Trigger only on PR creation or if the title (not description, etc.) is edited.
+        if: ${{ github.event_name != 'pull_request' || github.event.action != 'edited' || github.event.changes.title }}
         runs-on: ubuntu-latest
         steps:
             - uses: actions/checkout@v4