[Swift] Annotate GTMFetcherDecoratorFetcherWillStartCompletionHandler with _Nullable_result #315

	name: CocoaPods

	on:
	push:
	branches: [ main ]
	paths:
	- 'Sources/**'
	- 'UnitTests/**'
	- '*.podspec'
	- '.github/workflows/cocoapods.yml'
	pull_request:
	branches: [ main ]
	paths:
	- 'Sources/**'
	- 'UnitTests/**'
	- '*.podspec'
	- '.github/workflows/cocoapods.yml'
	schedule:
	# Run the first and fifteenth of every month at 5:12 UTC
	- cron: '12 5 1,15 * *'
	# Also allow manual triggering from the github UX to revalidate things.
	workflow_dispatch:

	jobs:
	pod-lib-lint:
	runs-on: macos-14
	strategy:
	fail-fast: false
	matrix:
	# watchOS fails linting when there are test, wedge in --skip-tests for
	# those runs.
	PLATFORM: ["ios", "macos", "tvos", "visionos", "watchos --skip-tests"]
	CONFIGURATION: ["Debug", "Release"]
	steps:
	# The "macos-14" image defaults to 15.0.1, select the newer Xcode.
	- name: Xcode version
	run: sudo xcode-select -switch /Applications/Xcode_15.2.app
	# The "macos-14" image has CocoaPods 1.14.x, and 1.15 is needed for visionOS
	- name: Update CocoaPods
	if: ${{ matrix.PLATFORM == 'visionos' }}
	run: gem install cocoapods
	- uses: actions/checkout@v4
	# Manually expanding out static frameworks to avoid making to many jobs.
	- name: Pod lib lint
	run: \|
	pod lib lint --verbose \
	--configuration=${{ matrix.CONFIGURATION }} \
	--platforms=${{ matrix.PLATFORM }} \
	GTMSessionFetcher.podspec
	- name: Pod lib lint - Use Static Frameworks
	run: \|
	pod lib lint --verbose --use-static-frameworks \
	--configuration=${{ matrix.CONFIGURATION }} \
	--platforms=${{ matrix.PLATFORM }} \
	GTMSessionFetcher.podspec

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