CI: Fix --allow-empty

wrong argument order, and I forgot that the PR CI itself won't test this
code path.

Author: nomeata

.github/workflows/main.yml

@@ -77,6 +77,6 @@ jobs:
             cp -a -v _site/. .
             #  Commit
             git add --all
-            git --allow-empty commit -m "[`date '+%F %T %Z'`] New release [ci skip]"
+            git commit --allow-empty -m "[`date '+%F %T %Z'`] New release [ci skip]"
             # Push
             git push origin main:main