Make the push trigger on tags

Author: ghaith

.github/workflows/docker.yml

@@ -3,10 +3,10 @@ name: Docker Image CI
 on:
   push:
     branches: [ main ]
+    tags:
+      - "v*"
   pull_request:
     branches: [ main ]
-  release:
-    types: [published]
 
 env:
   IMAGE_NAME: rust-llvm