Problem statement: release-please will only rebuild a release PR when the body of the PR changes.

Current solution: run a workflow that forces the PR to be rebuilt by changing the PR body.

Problems with current solution: Requires manual work.

New proposed solution: We append Last commit: $SHA to the bottom of every PR body (and therefore changelog). This will have the effect of rebuilding the PR for every commit without including changelog entries for chore commits. (edited)