Use env vars in GHA dependabot changelog (#14772)

.github/workflows/dependabot_changelog.yml

@@ -6,7 +6,7 @@ on:
  - reopened # For debugging!
 
 permissions:
- # Needed to be able to push the commit. See 
+ # Needed to be able to push the commit. See
  # https://docs.github.com/en/code-security/dependabot/working-with-dependabot/automating-dependabot-with-github-actions#enable-auto-merge-on-a-pull-request
  # for a similar example
  contents: write
@@ -20,8 +20,11 @@ jobs:
  with:
  ref: ${{ github.event.pull_request.head.ref }}
  - name: Write, commit and push changelog
+ env:
+ PR_TITLE: ${{ github.event.pull_request.title }}
+ PR_NUMBER: ${{ github.event.pull_request.number }}
  run: |
- echo "${{ github.event.pull_request.title }}." > "changelog.d/${{ github.event.pull_request.number }}".misc
+ echo "${PR_TITLE}." > "changelog.d/${PR_NUMBER}".misc
  git add changelog.d
  git config user.email "github-actions[bot]@users.noreply.github.com"
  git config user.name "GitHub Actions"

changelog.d/14772.misc

@@ -0,0 +1 @@
+Change GHA CI job to follow best practices.