build: add audit buck build steps #3

	name: Buck2 audit
	on:
	pull_request:
	branches: [main]
	types: [opened, synchronize, labeled, unlabeled]

	jobs:
	buck2-test:
	name: Buck2 Audit
	runs-on: ubuntu-latest
	steps:
	- name: Install Nix
	uses: DeterminateSystems/nix-installer-action@v4
	- name: Run the Magic Nix Cache
	uses: DeterminateSystems/magic-nix-cache-action@v2
	- uses: actions/checkout@v3
	- name: Prepare Buck2 audit args from labels
	id: prepare_args
	run: \|
	ARGS=""
	cat <<EOF > labels.json
	${{ toJSON(github.event.pull_request.labels.*.name) }}
	EOF
	for LABEL in dashboard consent core; do
	case "$LABEL" in
	dashboard\|consent)
	ARGS+=" //apps/$LABEL:audit"
	;;
	core)
	ARGS+=" //core/api:audit"
	;;
	esac
	done
	echo "Prepared args: $ARGS"
	echo "args=$ARGS" >> "$GITHUB_OUTPUT"
	- name: Buck2 test
	run: nix develop -c buck2 test ${{ steps.prepare_args.outputs.args }}

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