feat: fix CI: restrict release-and-push job to master branch only

[Copilot]

The "Release And Push" workflow job was appearing in PR checks despite being skipped, causing confusion. It should only run after PR merge to master.

Changes

Added github.ref == 'refs/heads/master' condition to restrict the release job to master branch pushes:

release-and-push:
  name: Release And Push
  runs-on: ubuntu-latest
  # Before: if: github.repository == 'casbin/caswaf' && github.event_name == 'push'
  if: github.repository == 'casbin/caswaf' && github.event_name == 'push' && github.ref == 'refs/heads/master'
  needs: [ frontend, backend]

The same condition was applied to the Docker login and push steps for consistency.

Impact

• PRs will no longer show this job in their checks
• Job only executes on master branch pushes (post-merge)

Original prompt

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This section details on the original issue you should resolve

<issue_title>[bug] needs to fix CI for strange check</issue_title>
<issue_description>In this open PR: #96, it runs this check:

failing checks
[Build / Release And Push (push)](https://github.com/casbin/caswaf/actions/runs/18801540259/job/53649846097?pr=96)
Build / Release And Push (push)Failing after 35s

I think for an open state PR, it should not run "Build / Release And Push (push)", right? It should run for the git push after PR merge?

Need to fix the CI.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [bug] needs to fix CI for strange check #101

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[github-actions]

🎉 This PR is included in version 1.57.0 🎉

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