fix: fix #630 Null check operator used on a null value #3

	# .github/workflows/publish.yml
	name: Publish retrofit_generator to pub.dev

	on:
	push:
	tags:
	- '[0-9]+.[0-9]+.[0-9]+*' # tag pattern on pub.dev: 'v'

	# Publish using custom workflow
	jobs:
	publish:
	permissions:
	id-token: write # Required for authentication using OIDC
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- uses: dart-lang/setup-dart@v1
	- name: Install dependencies
	run: cd generator && dart pub get
	# Here you can insert custom steps you need
	# - run: dart tool/generate-code.dart
	- name: Config examples
	run: cp -r example generator/example
	- name: Release new version
	run: \|
	cd generator
	RELEASE=${GITHUB_REF##*/}
	sed -i -e "s/version:.*/version: $RELEASE/g" pubspec.yaml
	- name: Publish
	run: cd generator && dart pub publish --force

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