fix: correct Docker manifest creation in builder image workflow

[Jguer]

• Fix "invalid reference format" error by properly separating Docker Hub and GitHub Container Registry tags
• Use short SHA format instead of long format for more manageable tags
• Improve manifest list creation process to handle multiple registries correctly
• Ensure proper handling of ghcr.io prefix for GitHub Container Registry

[Copilot]

PR Overview

This PR fixes an "invalid reference format" error by correcting Docker manifest creation in the builder image workflow, while also switching to a short SHA format to simplify tag management.

• Update the SHA tag format from long to short.
• Separate Docker Hub and GitHub Container Registry tag extraction.
• Create distinct manifest lists for Docker Hub and GitHub Container Registry.

Reviewed Changes

File	Description
.github/workflows/builder-image.yml	Updated tag extraction logic and manifest list creation to handle tags for two registries

Copilot reviewed 1 out of 1 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (1)

.github/workflows/builder-image.yml:128

• Similarly, ensure that the extraction of GitHub Container Registry tags safely handles tag values with spaces by verifying proper quoting or delimiting.

GHCR_TAGS=$(echo '${{ steps.meta.outputs.tags }}' | grep "^ghcr.io" | xargs -I {} echo "-t {}")

[Copilot]

Consider wrapping the command substitution in quotes or otherwise ensuring that whitespace in tag values is handled correctly, to prevent potential splitting issues.

Suggested change

	DH_TAGS=$(echo '${{ steps.meta.outputs.tags }}' | grep -v "^ghcr.io" | xargs -I {} echo "-t {}")
	# Extract GitHub Container Registry tags
	GHCR_TAGS=$(echo '${{ steps.meta.outputs.tags }}' | grep "^ghcr.io" | xargs -I {} echo "-t {}")
	DH_TAGS="$(echo '${{ steps.meta.outputs.tags }}' | grep -v "^ghcr.io" | xargs -I {} echo "-t {}")"
	# Extract GitHub Container Registry tags
	GHCR_TAGS="$(echo '${{ steps.meta.outputs.tags }}' | grep "^ghcr.io" | xargs -I {} echo "-t {}")"