ci: enable automerge for created pull requests (#154)

Added a step to enable automerging of the created pull request.

Author: wax911

.github/workflows/release-drafter.yml

@@ -90,6 +90,7 @@ jobs:
           npm version "${{ needs.release-drafter.outputs.resolved_version }}" --no-git-tag-version
 
       - name: Create Pull Request
+        id: create-pull-request
         if: steps.version_check.outputs.needs_update == 'true'
         uses: peter-evans/create-pull-request@v8
         env:
@@ -107,4 +108,12 @@ jobs:
           body: |
             This PR was automatically generated to update the package version.
           branch: build/bump-package-version
-          labels: "version-bump,:skateboard: skip-changelog"
+          labels: "version-bump,:skateboard: skip-changelog"
+
+      - name: Enable Pull Request Automerge
+        if: steps.create-pull-request.outputs.pull-request-operation == 'created'
+        uses: peter-evans/enable-pull-request-automerge@v3
+        with:
+          token: ${{ steps.app-token.outputs.token }}
+          pull-request-number: ${{ steps.create-pull-request.outputs.pull-request-number }}
+          merge-method: rebase