Setup Iceberg credentials

 
StartupPreferencesLoader default executeAtomicItems: {
        StartupAction
                name: 'Git Settings'
                code: [
                        FileStream stdout
                                cr; nextPutAll: 'Setting the ssh credentials'; cr.
                        Iceberg enableMetacelloIntegration: true.
                        IceCredentialsProvider useCustomSsh: true.
                        IceCredentialsProvider sshCredentials
                                        username: 'git';
                                        publicKey: '/Users/ducasse/.ssh/id_rsa.pub';
                                        privateKey: '/Users/ducasse/.ssh/id_rsa'.
                        IceCredentialsProvider
                                plaintextCredentials: (IcePlaintextCredentials new username: 'Ducasse'; password: 'xxxx' ; yourself ).
                        FileStream stdout
                                cr; nextPutAll: 'Finished'; cr ].
}.