ci: fix release (#249)

Author: nakamasato

.github/workflows/release.yml

@@ -1,8 +1,9 @@
 name: release
 
 on:
-  release:
-    types: [published]
+  push:
+    tags:
+      - 'v*'
 
 env:
   REGISTRY: ghcr.io
@@ -11,6 +12,7 @@ env:
 jobs:
   build-and-push-image:
     runs-on: ubuntu-latest
+    if: ${{ github.ref == 'refs/heads/main' }}
     permissions:
       contents: read
       packages: write
@@ -37,7 +39,7 @@ jobs:
         with:
           context: .
           push: true
-          tags: ${{ steps.meta.outputs.tags }}
+          tags: ${{ github.event.release.tag_name }}
           labels: ${{ steps.meta.outputs.labels }}
 
   create-pr-to-update-kustomization: