Use comment-action for diff (#141)

Author: int128

.github/workflows/manifest.yaml

@@ -41,6 +41,14 @@ jobs:
           ignore-kustomize-error: true
 
       - uses: int128/diff-action@db6cce01542cb26e181798736eea1e71f5d36706 # v1.51.0
+        id: diff
         with:
           base: ${{ steps.kustomize-base.outputs.directory }}
           head: ${{ steps.kustomize-head.outputs.directory }}
+          comment: false
+      - uses: int128/comment-action@a20dbdebd79ab886a1e7a20d16bfa7dbaa732e5a # v1.33.0
+        with:
+          update-if-exists: replace
+          post: |
+            ## kustomize diff
+            ${{ steps.diff.outputs.comment-body }}