ci: Add auto-format workflow #4

	name: Auto-format with Nox

	on:
	pull_request:
	branches:
	- main

	permissions:
	contents: write

	jobs:
	format:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout code
	uses: actions/checkout@v4
	with:
	ref: ${{ github.event.pull_request.head.ref }}
	token: ${{ secrets.A2A_BOT_PAT }}

	- name: Set up Python
	uses: actions/setup-python@v5
	with:
	python-version: "3.10"

	- name: Install Nox
	run: pip install nox

	- name: Run Nox formatting session
	run: nox -s format

	- name: Check for changes and commit if any
	id: commit_changes
	run: \|
	git config user.name "a2a-bot"
	git config user.email "a2a-bot@google.com"

	# Check if there are any changes after running Nox
	if [ -n "$(git status --porcelain)" ]; then
	echo "::notice file=./.github/workflows/auto-format.yml::Formatting changes detected. Committing..."
	git add .
	git commit -m "chore(format): Auto-format code with Nox"
	git push origin HEAD:${{ github.event.pull_request.head.ref }}
	echo "changes_committed=true" >> "$GITHUB_OUTPUT"
	else
	echo "No formatting changes detected. Repository is clean."
	echo "changes_committed=false" >> "$GITHUB_OUTPUT"
	fi

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