feat: Add a reference to the commit that triggered the update (#71)

This makes it much easier when approving the deployment commits

.github/workflows/update-infrastructure-repo.yaml

@@ -95,9 +95,10 @@ jobs:
           branch: ${{ steps.set-branch-name.outputs.BRANCH }}
           delete-branch: true
           body: |
-            - Auto-generated by [create-pull-request][1]
+            Changes from ${{ github.server_url }}/${{ github.repository }}/commit/${{ github.sha }}
+
+            ${{ github.event.head_commit.message }}
 
-            [1]: https://github.com/peter-evans/create-pull-request
           labels: |
             automated pr