ci: fix tag naming pattern

Author: rizlas

.github/workflows/docker-image.yml

@@ -4,7 +4,7 @@ name: Docker Image CI
 on:
   push:
     tags:
-      - "[0-9]+.[0-9]+.[0-9]+"
+      - "v[0-9]+.[0-9]+.[0-9]+"
   workflow_dispatch:
     inputs:
       upstream_tag: