Update the API to support streaming and decompressing of golden images in .img.xz and .img.gz formats on the fly. Modify the cloud-init build process to compress images to .img.xz for size reduction. Revise the dashboard templates to set 'desktop' as the default variant for Raspberry Pi OS builds, improving user experience and clarity in options. Update related scripts to ensure compatibility with the new image handling features.
Implement a new API endpoint to update existing cloud-init templates, allowing users to modify template attributes such as name, user_data, meta_data, and network_config. Enhance the dashboard UI to include an update button for templates, along with associated JavaScript for handling update requests. This improves user experience by enabling direct template modifications from the interface.
