fix: incorrect env variable in ci

Author: christyjacob4

.github/workflows/docker-publish.yml

@@ -23,4 +23,4 @@ jobs:
         with:
           context: .
           push: true
-          tags: ghcr.io/appwrite/monitoring:${{ env.TAG }}
+          tags: ghcr.io/appwrite/monitoring:${{ github.event.release.tag_name }}