chore(ci): tag doesn't include dockerhub username

Author: galacticglum

.github/workflows/release.yml

@@ -23,7 +23,7 @@ jobs:
         uses: docker/metadata-action@v4
         with:
           images: |
-            sqrl-server
+            ${{ secrets.DOCKERHUB_USERNAME }}/sqrl-server
           tags: |
             type=ref,event=branch
             type=ref,event=pr