public static InstallerConfiguration getInstallerConf() {
        if (installerConf == null) {
            synchronized (InstallerConfiguration.class) {
                if (installerConf == null) {
                    installerConf = new InstallerConfiguration();
                }
            }
        }
        return installerConf;
    }
Singleton for agent configuration.

@return static instance of InstallerConfiguration
inlong-agent/agent-installer/src/main/java/org/apache/inlong/agent/installer/conf/InstallerConfiguration.java