Remove non-semver tags from docker workflow

Author: sim642

.github/workflows/docker.yml

@@ -55,7 +55,6 @@ jobs:
           tags: |
             type=schedule
             type=semver,pattern={{version}}
-            type=ref,event=tag
             type=raw,enable=${{ github.event_name == 'workflow_dispatch' }},value=${{ github.event.inputs.tag }}
 
       - name: Build Docker image