fix: use --user/--pass long flags for regctl registry set

.gitea/workflows/docker.yml

@@ -84,8 +84,8 @@ jobs:
         if: github.event_name != 'pull_request'
         run: |
           regctl registry set ${{ env.REGISTRY }} \
-            -u ${{ secrets.REGISTRY_USER }} \
-            -p ${{ secrets.REGISTRY_PASSWORD }} \
+            --user "${{ secrets.REGISTRY_USER }}" \
+            --pass "${{ secrets.REGISTRY_PASSWORD }}" \
             --auth-basic
 
       - name: Push standard image