NO-ISSUE: allow empty commits in deploy workflow (#134)

Adds `--allow-empty` to the `git commit` in the deploy workflow so that
deploys with no content change (e.g. a no-op trigger commit) don't fail.
This also unblocks the current stuck GitHub Pages build on atlas.

Co-authored-by: Lauren Gottberg <lauren@gradienthealth.io>

Author: lgottber

.github/workflows/deploy_production_ghpages.yml

@@ -98,5 +98,5 @@ jobs:
           git config --global user.email "${{ github.actor_id }}+${{ github.actor }}@users.noreply.github.com"
           git remote set-url origin https://${{ github.actor }}:${{ secrets.GH_DEPLOY_TOKEN }}@github.com/gradienthealth/atlas
           git add .
-          git commit -a -m "Deploying PR #${{ github.event.pull_request.number }} merged by ${{ github.actor }}"
+          git commit --allow-empty -a -m "Deploying PR #${{ github.event.pull_request.number }} merged by ${{ github.actor }}"
           git push -u origin