Editing of cloud-init YAML at VM Creation

[nxzz]

Hello cockpit-machines maintainers and community,

I would like to propose an enhancement aimed at expanding the existing capabilities of cloud-init integration within Cockpit-machines. While the current interface supports basic cloud-init settings such as setting usernames and passwords, it lacks the ability to submit a complete cloud-init YAML configuration directly.

nxzz@87c0ba0

To address this, I have developed a feature that allows users to directly input or paste their entire cloud-init YAML configuration (see attached screenshot). This new field offers greater flexibility and enables users to utilize the full capabilities of cloud-init without restrictions.

Ideally, it would be preferable if all cloud-init functionalities could be configured directly via the form interface in Cockpit-machines. However, considering the vast number of configurable options available in cloud-init, it is not practical to provide a dedicated form field for each setting.

If this direction is accepted, I will refine the code, form and create pull request.

I would appreciate your feedback on this proposal.

Thank you.