dlstreamer build workflows

[arodage]

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

Build workflows for dlstreamer images is missing

Added CI workflows and build scripts for DLStreamer images:
- azl3-x86_64-dlstreamer
- elxr12-x86_64-dlstreamer
- emt3-x86_64-dlstreamer
- ubuntu24-x86_64-dlstreamer

Workflows trigger on push/PR to main and support manual dispatch
with optional QEMU boot testing.

Any Newly Introduced Dependencies

How Has This Been Tested?

[Copilot]

Pull request overview

This PR adds CI/CD infrastructure for building DLStreamer images across multiple distributions. It introduces GitHub Actions workflows and build scripts for four image variants (azl3, elxr12, emt3, ubuntu24), along with improvements to RPM package resolution to prefer distribution-specific packages.

Changes:

• Added four GitHub Actions workflows for building DLStreamer images with optional QEMU boot testing
• Created build scripts for each image variant with shared QEMU testing logic
• Enhanced RPM dependency resolution to prioritize packages matching the target distribution
• Modified GPG component shutdown to treat failures as non-fatal warnings
• Updated azl3-dlstreamer template to use generic kernel-drivers-gpu package

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
.github/workflows/build-azl3-dlstreamer.yml	Workflow for building AZL3 DLStreamer images
.github/workflows/build-elxr12-dlstreamer.yml	Workflow for building ELXR12 DLStreamer images
.github/workflows/build-emt3-dlstreamer.yml	Workflow for building EMT3 DLStreamer images
.github/workflows/build-ubuntu24-dlstreamer.yml	Workflow for building Ubuntu24 DLStreamer images
scripts/build_azl3_dlstreamer.sh	Build script for AZL3 DLStreamer image with QEMU testing
scripts/build_elxr12_dlstreamer.sh	Build script for ELXR12 DLStreamer image with QEMU testing
scripts/build_emt3_dlstreamer.sh	Build script for EMT3 DLStreamer image with QEMU testing
scripts/build_ubuntu24_dlstreamer.sh	Build script for Ubuntu24 DLStreamer image with QEMU testing
internal/ospackage/rpmutils/helper.go	Enhanced package resolution to prefer distribution-specific packages
internal/utils/system/system.go	Changed GPG component stop failures to warnings
internal/utils/system/system_test.go	Updated test to reflect non-fatal GPG kill failures
image-templates/azl3-x86_64-dlstreamer.yml	Changed to use generic kernel-drivers-gpu package

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.