Only validate a single file on `didChange` #137

	name: "Add Copyright Headers"

	on:
	pull_request_target:
	types:
	- opened
	- reopened
	- synchronize
	- ready_for_review
	workflow_dispatch: {}

	jobs:
	add-copyright-headers:
	runs-on: ubuntu-latest
	env:
	HEAD_REF: ${{ github.event.pull_request.head.ref }}
	permissions:
	contents: write
	steps:
	- name: Checkout
	uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # https://github.com/actions/checkout/releases/tag/v3.6.0
	with:
	ref: ${{ github.event.pull_request.head.ref }}
	repository: ${{ github.event.pull_request.head.repo.full_name }}
	- name: Set git identity
	run: \|-
	git config user.name "hashicorp-copywrite[bot]"
	git config user.email "110428419+hashicorp-copywrite[bot]@users.noreply.github.com"
	- name: Setup Copywrite tool
	uses: hashicorp/setup-copywrite@867a1a2a064a0626db322392806428f7dc59cb3e # v1.1.2
	- name: Add headers using Copywrite tool
	run: copywrite headers
	- name: Check if there are any changes
	id: get_changes
	run: echo "changed=$(git status --porcelain \| wc -l)" >> $GITHUB_OUTPUT
	- name: Push changes
	if: steps.get_changes.outputs.changed != 0
	run: \|-
	git add .
	git commit -s -m "[COMPLIANCE] Add required copyright headers"
	git push origin HEAD:$HEAD_REF

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