ci: implement GitHub Actions workflows for AUR automation

Author: xifan2333

.github/workflows/build-and-publish.yml

@@ -122,6 +122,7 @@ jobs:
           commit_username: github-actions[bot]
           commit_email: github-actions[bot]@users.noreply.github.com
           ssh_private_key: ${{ secrets.AUR_SSH_KEY }}
+          ssh_keyscan_types: rsa,ecdsa,ed25519
           commit_message: |
             Update to ${{ steps.pkgver.outputs.version }}