ci(node): generate a single library as a smoke test during presubmits, and generate --all in postsubmits #12159

	# Copyright 2025 Google LLC
	#
	# 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
	#
	# https://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: Python
	on: [push, pull_request, merge_group]
	permissions:
	contents: read
	jobs:
	test:
	runs-on: ubuntu-24.04
	# Presubmit jobs must complete within 5 minutes. See CONTRIBUTING.md.
	timeout-minutes: 5
	steps:
	- uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
	with:
	persist-credentials: false
	- uses: ./.github/actions/setup-librarian
	- uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6
	with:
	python-version: "3.14"
	- name: Install pandoc
	run: \|
	set -e
	curl -fsSL --retry 5 --retry-delay 15 -o /tmp/pandoc.tar.gz https://github.com/jgm/pandoc/releases/download/$VERSION/pandoc-$VERSION-linux-amd64.tar.gz
	sudo tar -xvf /tmp/pandoc.tar.gz -C /usr/local --strip-components=1
	pandoc --version
	env:
	VERSION: 3.8.2
	- name: Install Python dependencies
	run: librarian install python
	- name: Run tests
	run: go run ./tool/cmd/coverage ./internal/librarian/python

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