chore: restrict packages-preview-release job to current repo only (#7343)

Signed-off-by: Ryan Wang <[email protected]>

Author: ruibaby

Diff for: .github/workflows/packages-preview-release.yaml

@@ -13,6 +13,7 @@ on:
 jobs:
   packages-preview-release:
     runs-on: ubuntu-latest
+    if: github.repository == 'halo-dev/halo'
     steps:
       - uses: actions/checkout@v4
       - name: Setup Environment