fix syntax error in for loop

.github/workflows/docker-build.yml

@@ -34,6 +34,6 @@ jobs:
       run: |
         tags=$(docker image inspect ghcr.io/ukhomeoffice/cc-lza-validator:latest | jq '.[0].RepoTags')
         echo $tags
-        for tag in $tags: do
+        for tag in $tags; do
           docker push $tag
         done