Docker update

[ntenney]

Updated to clone the volttron repo instead of copying it from the submodule. Removed the submodule. Modified the Dockerfile and Dockerfile-dev files to allow users to set the repository and branch/tag to clone. Updated the publish_develop_image.yml file to remove the submodule step. Updated the README.md documentation.

[Copilot]

Pull Request Overview

This PR updates the repository cloning method by switching from using a submodule to cloning the volttron repository directly, and adjusts related Docker and documentation configurations. Key changes include:

• Updated Dockerfile and Dockerfile‑dev to accept repository and branch/tag build arguments.
• Removed submodule steps from the workflow and documentation.
• Extended platform configuration to optionally create and save web user settings.

Reviewed Changes

Copilot reviewed 3 out of 7 changed files in this pull request and generated no comments.

File	Description
core/setup-platform.py	Added functions to create and save web user configurations; updated unpacking of get_platform_configurations.
README.md	Updated instructions to reflect the new cloning method and build process.
.github/workflows/publish_develop_image.yml	Removed deprecated submodule cloning step.

Files not reviewed (4)

• .gitmodules: Language not supported
• Dockerfile: Language not supported
• Dockerfile-dev: Language not supported
• volttron: Language not supported

Comments suppressed due to low confidence (1)

core/setup-platform.py:386

• [nitpick] For clarity and consistency with the 'get_platform_configurations' function, consider renaming the unpacked 'web_users' variable to 'web_users_params'.

config_tmp, agents_tmp, platform_cfg_tmp, web_users = get_platform_configurations(get_platform_config_path())