Docker installer workflow and licensing flow done - docker container is working fine

cygnus-installer/README.md

@@ -21,9 +21,12 @@ INI. Both profiles use these cloud endpoints by default:
 - `POST /api/v1/installations/register`
 
 The desktop wizard is the default. It checks Docker, collects activation and
-installation details, lets the user choose an output directory, and reports
-installation progress. For servers without a desktop or for automation, append
-`--cli` to retain the interactive terminal workflow:
+installation details, asks for the Docker registry, image, username, and
+password, lets the user choose an output directory, and reports installation
+progress. It authenticates with `docker login --password-stdin`; the registry
+password is never written into generated files or command arguments. For
+servers without a desktop or for automation, append `--cli` to retain the
+interactive terminal workflow:
 
 ```bash
 TECHNOBEE_INSTALLER_CONFIG=cygnus-installer/config/matrix-installer.ini \
@@ -48,6 +51,7 @@ configuration_root=matrix
 configuration_file_name=installation.yml
 installation_config_environment_variable=MATRIX_INSTALLATION_CONFIG
 container_configuration_path=/opt/matrix/config/installation.yml
+port_mapping=8080:8080
 token_path=/oauth2/token
 assertion_encryption_public_key=/secure/cloud-assertion-public.pem
 optional_fields=
@@ -72,7 +76,8 @@ config/
 The installer asks for the product Docker image, validates it, and stores it
 under the profile's image variable in `.env`. Docker Compose loads this file
 automatically, so no separate `export MATRIX_IMAGE` or `export CYGNUS_IMAGE`
-step is required.
+step is required. Docker stores successful login state using its configured
+credential store; the installer does not persist the registry password.
 
 The RSA-3072 pair is generated locally. Only the public key is sent during
 registration. The private key and encrypted machine assertion remain on