fix(wordpress): set plugin ownership before post-install commands

[vitormattos]

Summary

This fix prevents startup crashes when a custom plugin post-install command needs write access to the plugin directory (for example, creating integrations/ACF symlink in polylang-pro).

Root cause

finalize_custom_plugin() was running post_install_commands as www-data before adjusting ownership of the cloned plugin directory. Since cloning is done as root, some commands failed with Permission denied and broke the bootstrap flow.

Change

• In .docker/wordpress/entrypoint.sh, run chown -R www-data:www-data "$plugin_dir" before run_custom_plugin_post_install_commands.

Validation

• Rebuilt WordPress image and restarted service.
• Confirmed container remained running.
• Checked logs for regressions (Permission denied, Fatal error, Class not found) and found none after the fix.