fix: fix oras path

[lilypan26]

What this PR does / why we need it:
fixes oras path that was changed in #7125

Which issue(s) this PR fixes:

Fixes #

[Copilot]

Pull request overview

Fixes the oras CLI invocation path in Linux CSE helpers (regressed when components were moved to /opt/bin in #7125) and updates generated CustomData snapshots accordingly.

Changes:

• Define ORAS=/opt/bin/oras and use it for oras pull/cp/login/logout/repo ls calls in cse_helpers.sh.
• Regenerate/update pkg/agent/testdata/**/CustomData snapshots to reflect the script change.

Reviewed changes

Copilot reviewed 38 out of 66 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
parts/linux/cloud-init/artifacts/cse_helpers.sh	Introduces ORAS path variable and updates oras command invocations to use it.
pkg/agent/testdata/MarinerV2+Kata/CustomData	Snapshot update after script change.
pkg/agent/testdata/MarinerV2+CustomCloud/CustomData	Snapshot update after script change.
pkg/agent/testdata/CustomizedImageLinuxGuard/CustomData	Snapshot update after script change.
pkg/agent/testdata/CustomizedImageKata/CustomData	Snapshot update after script change.
pkg/agent/testdata/CustomizedImage/CustomData	Snapshot update after script change.

[Copilot]

Hardcoding ORAS=/opt/bin/oras can break backward compatibility when newer CSE scripts run on older VHDs that may still have oras in a different location (e.g., /usr/local/bin/PATH). Consider resolving ORAS dynamically (prefer /opt/bin/oras when present, otherwise fall back to command -v oras/known legacy paths) and fail with a clear error if no binary is found.

Suggested change

	ORAS=/opt/bin/oras
	# Resolve ORAS dynamically to maintain compatibility across VHDs.
	if [ -x /opt/bin/oras ]; then
	ORAS=/opt/bin/oras
	elif command -v oras >/dev/null 2>&1; then
	ORAS="$(command -v oras)"
	elif [ -x /usr/local/bin/oras ]; then
	ORAS=/usr/local/bin/oras
	else
	echo "ERROR: oras binary not found. Expected at /opt/bin/oras or in PATH (e.g., /usr/local/bin/oras)." >&2
	exit 1
	fi

[djsly]

isn't this path not present on older VHD, could this cse script run on older VHD ?

[awesomenix]

after discussing in teams this will break old VHD which is still using /usr/local/bin path

[djsly]

probably not needed.