Show commit subjects on Netlify deploys

Production deploys now upload the already-built dist directory from
GitHub Actions. Unlike Netlify's Git-driven deploys for previews/branch
deploys, this CLI upload does not automatically populate the deploy
message. So pass the latest commit subject explicitly.

Author: john-kurkowski

.github/workflows/vrt.yml

@@ -76,9 +76,11 @@ jobs:
         run: npm run build
 
       - name: Deploy to Netlify
-        run: >
-          npx --yes netlify-cli deploy --prod --dir=dist --site
-          "$NETLIFY_SITE_ID" --auth "$NETLIFY_AUTH_TOKEN"
+        run: |
+          deploy_message="$(git log -1 --pretty=%s)"
+          npx --yes netlify-cli deploy --prod --dir=dist --site \
+            "$NETLIFY_SITE_ID" --auth "$NETLIFY_AUTH_TOKEN" \
+            --message "$deploy_message"
         env:
           NETLIFY_AUTH_TOKEN: ${{ secrets.NETLIFY_AUTH_TOKEN }}
           NETLIFY_SITE_ID: ${{ secrets.NETLIFY_SITE_ID }}