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fix: Correctly set the credentials token source and the WithIAMAuthN opt #588

	# Copyright 2024 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
	#
	# http://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
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	name: docs
	on:
	pull_request:

	# Declare default permissions as read only.
	permissions: read-all

	jobs:
	docs:
	name: Check docs are up to date
	runs-on: ubuntu-latest
	steps:
	- name: Setup Go
	uses: actions/setup-go@40f1582b2485089dde7abd97c1529aa768e1baff # v5.6.0
	with:
	go-version: "1.25"
	- name: Checkout code
	uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
	- name: Generate docs and fail if there are differences
	run: \|
	go install ./cmd/gendocs
	gendocs
	git diff --exit-code

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