happybell80 f553408cc4 Fix SSH authentication issues in GitHub Actions
- Add SSH key verification step with ssh-add -l
- Properly configure known_hosts with ssh-keyscan
- Add SSH connection test before rsync
- Remove StrictHostKeyChecking=no from rsync and remote commands
- Follow webfactory/ssh-agent best practices

Resolves SSH key authentication failures during deployment

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Co-Authored-By: Claude <noreply@anthropic.com>
2025-07-07 22:51:18 +09:00
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