Ubuntu PTL with DLS and Fixes for apt update not working

[samueltaripin]

Merge Checklist

All boxes should be checked before merging the PR

• [/] The changes in the PR have been built and tested
• [/] Ready to merge

Description

1. Apt update fixed
2. Ubuntu PTL with DLS

Any Newly Introduced Dependencies

How Has This Been Tested?

[Copilot]

Pull request overview

This PR fixes apt update issues by modifying GPG key handling and apt sources configuration, and adds a new Ubuntu 24.04 PTL (Panther Lake) image template with DLS (DL Streamer) support. The changes move away from using signed-by directives in apt sources to a simpler format that relies on GPG keys placed in the global trusted keyring directory.

Changes:

• Modified apt sources generation to use simple format without signed-by directives
• Changed GPG key storage location from /usr/share/keyrings/ to /etc/apt/trusted.gpg.d/
• Added automatic GPG key dearmorming (ASCII to binary conversion)
• Added new Ubuntu 24.04 PTL image template with DLS packages

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 12 comments.

File	Description
internal/config/apt_sources.go	Removed signed-by directives from apt sources generation, changed GPG key paths to /etc/apt/trusted.gpg.d/, added dearmorGPGKey function, consolidated GPG key file creation logic, and added 0644 permissions to GPG key files
config/osv/ubuntu/ubuntu24/imageconfigs/additionalfiles/ubuntu-noble.list	Updated to simple deb line format without signed-by directives
image-templates/ubuntu24-x86_64-minimal-ptl-dls.yml	New image template for Ubuntu 24.04 PTL with DLS support including Docker, DL Streamer, and PTL-specific packages and configurations

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