feat: Add lockfile attestor #1376

	# Copyright 2022 The Witness Contributors
	#
	# Licensed under the Apache License, Version 2.0 (the "License");
	# you may not use this file except in compliance with the License.
	# You may obtain a copy of the License at
	#
	# http://www.apache.org/licenses/LICENSE-2.0
	#
	# Unless required by applicable law or agreed to in writing, software
	# distributed under the License is distributed on an "AS IS" BASIS,
	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	# See the License for the specific language governing permissions and
	# limitations under the License.

	name: Verify License
	on:
	workflow_dispatch:
	push:
	branches: ['main', 'release-*']
	pull_request:
	permissions:
	contents: read

	jobs:
	license-check:
	name: license boilerplate check
	runs-on: ubuntu-latest
	steps:
	- name: Harden Runner
	uses: step-security/harden-runner@91182cccc01eb5e619899d80e4e971d6181294a7 # v2.10.1
	with:
	egress-policy: audit

	- uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0
	- uses: actions/setup-go@0a12ed9d6a96ab950c8f026ed9f722fe0da7ef32 # v5.0.2
	with:
	go-version: '1.22.x'
	- name: Install addlicense
	run: go install github.com/google/[email protected]
	- name: Check license headers
	run: \|
	set -e
	addlicense --check -l apache -c 'The Witness Contributors' --ignore "*/.xml" -v *

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