automerge and PR description (#108)

.github/workflows/auto-pr.yml

@@ -22,11 +22,14 @@ jobs:
         fetch-depth: 0
 
     - name: Update
+      id: update
       run: |
         cd deps/microzig
         git pull origin main
+        echo "DESCRIPTION=$(git log -1 --pretty=%B | head -n 1)" >> $GITHUB_OUTPUT
 
     - name: Create Pull Request
+      id: cpr
       uses: peter-evans/create-pull-request@v4.2.3
       with:
         token: ${{ secrets.PR_TOKEN }}
@@ -34,4 +37,12 @@ jobs:
         commit-message: update microzig
         delete-branch: true
         title: Update microzig
+        body: ${{ steps.update.outputs.DESCRIPTION }}
 
+    - name: Enable Pull Request Automerge
+      if: steps.cpr.outputs.pull-request-operation == 'created'
+      uses: peter-evans/enable-pull-request-automerge@v2
+      with:
+        token: ${{ secrets.PR_TOKEN }}
+        pull-request-number: ${{ steps.cpr.outputs.pull-request-number }}
+        merge-method: squash