Update Copyright headers, add workflow to enforce #709

	# SPDX-FileCopyrightText: Copyright 2023 The Minder Authors
	# SPDX-License-Identifier: Apache-2.0

	# This test verifies that Pull Requests don't touch the merged database migrations.
	# Folks should now only be adding new migrations to the `database/migrations/` directory.
	name: Database Migrations Untouched
	on:
	pull_request:
	paths:
	- 'database/migrations/*'
	- '.github/workflows/migrate-touch.yml'
	jobs:
	verify-migrations:
	name: Don't touch existing migrations
	runs-on: ubuntu-latest
	steps:
	- name: Checkout code
	uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
	with:
	fetch-depth: 0
	- name: Verify Migration Files
	run: \|
	# Check out the base branch
	git checkout $GITHUB_BASE_REF
	# Get files in migration directory before our changes
	BEFORE=$(find database/migrations/ -type f \| sort)
	echo "Files before: $BEFORE"

	# Check out our changes
	git checkout $GITHUB_SHA -- database/migrations/

	# Verify that the existing migration files were not touched by the new changes
	modified=$(git diff --name-only origin/$GITHUB_BASE_REF $GITHUB_SHA -- database/migrations/)
	echo "Files modified: $modified"
	for file in $modified; do
	if [[ $BEFORE == "$file" ]]; then
	echo "ERROR: $file was modified by this PR. Please only add new migrations to the database/migrations/ directory."
	exit 1
	fi
	done
	shell: bash

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