Added sliver persistent header #76

	# This workflow uses actions that are not certified by GitHub.
	# They are provided by a third-party and are governed by
	# separate terms of service, privacy policy, and support
	# documentation.

	name: Flutter build and test

	on: push

	env:
	FLUTTER_FOLDER: '$HOME/flutter'

	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3

	- name: Cache Flutter
	id: cache-flutter
	uses: actions/cache@v3
	with:
	path: \|
	flutter
	~/.pub-cache

	key: flutter-${{ hashFiles('**/pubspec.lock') }}

	- if: ${{ steps.cache-flutter.outputs.cache-hit != 'true' }}
	name: Install Flutter
	run: git clone https://github.com/flutter/flutter.git --depth 1 -b stable $FOLDER

	- name: Add Flutter to PATH
	run: echo "$GITHUB_WORKSPACE/flutter/bin" >> $GITHUB_PATH

	- if: ${{ steps.cache-flutter.outputs.cache-hit != 'true' }}
	name: Install dependencies
	run: flutter pub get

	- name: Verify formatting
	run: dart format --output=none --set-exit-if-changed lib/ test/

	- name: Analyze project source
	run: flutter analyze --no-fatal-infos lib/ test/

	- name: Run tests
	run: flutter test

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