Add Github workflow for updating Github Actions. #3

	---
	name: Update GitHub Actions
	on:
	schedule:
	- cron: 0 3 * * 0
	push:
	jobs:
	update_github_actions:
	name: Update GitHub Actions
	runs-on: ubuntu-latest
	steps:
	- name: Look up Git repository in cache
	uses: actions/cache/restore@v4
	with:
	path: .git/
	key: update-github-actions-cache-git-${{ github.run_id }}
	restore-keys: \|
	update-github-actions-cache-git
	- name: Checkout
	uses: actions/checkout@v4
	with:
	ref: bugfix
	- name: Setup Python
	uses: actions/setup-python@v5
	with:
	python-version-file: .version-python
	- name: Setup git
	uses: fregante/setup-git-user@v2
	- name: Generate token
	uses: actions/create-github-app-token@v1
	id: app-token
	with:
	app-id: ${{ secrets.TOKEN_APP_ID }}
	private-key: ${{ secrets.TOKEN_APP_SECRET }}
	- name: Update GitHub Actions
	run: \|
	GITHUB_TOKEN=${{ steps.app-token.outputs.token }} ./build update_github_actions
	git add .github/workflows/.yml
	- name: Check for uncommitted changes
	id: check-for-changes
	run: git diff-index --cached --quiet HEAD \|\| echo "has-changes=true" >> $GITHUB_OUTPUT
	- name: Commit changes
	if: ${{ steps.check-for-changes.outputs.has-changes == 'true' }}
	run: git commit -m "[Bot] Update GitHub Actions."
	- name: Save Git repository to cache
	uses: actions/cache/save@v4
	if: success() \|\| failure()
	with:
	path: .git/
	key: update-github-actions-cache-git-${{ github.run_id }}

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