The error message you encountered suggests that there is a permission issue with accessing the remote repository when deploying your PHP code through Git version control in cPanel. To troubleshoot and resolve this error, you can follow these steps:
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Verify SSH keys: Ensure that you have set up SSH keys correctly for authentication. Make sure that the public key is added to the appropriate repository hosting service (e.g., GitHub, Bitbucket) and that the corresponding private key is present on the server where cPanel is running.
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Check repository URL: Double-check the repository URL specified in cPanel's Git deployment settings. Ensure that it is the correct URL for your repository and that it is accessible.
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Confirm repository existence: Ensure that the repository actually exists in the specified URL. Check for typos in the repository name or the URL.
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Review repository permissions: Verify that the user or account running the deployment process has the necessary permissions to access the repository. This includes both read and write permissions, depending on the deployment configuration.
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Test SSH connection: Use the SSH command-line interface to manually test the SSH connection to the repository hosting service. This will help identify any issues with SSH key authentication or connectivity.
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Check firewall or security settings: Verify that there are no firewall rules or security configurations blocking the outgoing SSH connections from the server running cPanel.
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Contact hosting provider: If you have tried the above steps and are still unable to resolve the issue, it is recommended to reach out to your hosting provider or cPanel support for further assistance. They may have specific guidelines or requirements for deploying code through Git in their environment.
By following these steps, you should be able to identify and resolve the "Permission denied (publickey)" error when deploying PHP code using Git version control in cPanel.