feat(ci): validate SHA256 for all archs (fix CARCH expansion) #4

	name: Validate SHA256sums
	on: pull_request
	jobs:
	validate-sha:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v7
	- uses: dorny/paths-filter@v4
	id: changes
	with:
	list-files: shell
	filters: \|
	pacscripts:
	- 'packages//.pacscript'
	- '.github/workflows/validate-sha.yml'
	- name: Validate hashes for all arches
	if: steps.changes.outputs.pacscripts == 'true'
	run: \|
	set -euo pipefail
	for f in ${{ steps.changes.outputs.pacscripts_files }}; do
	[[ $f == *.pacscript ]] \|\| continue
	echo "::group::Checking $f"
	# get arch list
	arch_list=$(bash -c 'source "$1"; echo "${arch[*]}"' _ "$f")
	for arch_name in $arch_list; do
	echo "-- $arch_name --"
	bash -c '
	export CARCH="$2"
	source "$1"
	for idx in "${!source[@]}"; do
	url="${source[$idx]}"
	eval "exp=\"\${sha256sums_${2}[$idx]:-}\""
	[[ -z "$exp" \|\| "$exp" == "SKIP" ]] && continue
	echo "URL: $url"
	echo "Expected: $exp"
	curl -LfsS "$url" -o /tmp/pkg.deb
	actual=$(sha256sum /tmp/pkg.deb \| cut -d" " -f1)
	echo "Actual: $actual"
	if [[ "$actual" != "$exp" ]]; then
	echo "::error::SHA mismatch in $1 [$2] - expected $exp got $actual"
	exit 1
	fi
	echo "OK"
	done
	' _ "$f" "$arch_name"
	done
	echo "::endgroup::"
	done

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