Port KerasNLP GPT-2 text generation example to multi-backend (#1432) #5121

	name: Continuous integration

	on: [push, pull_request]

	jobs:
	black:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- uses: actions/setup-python@v1
	with:
	python-version: 3.9
	- name: Ensure files are formatted with black
	run: \|
	pip install --upgrade pip
	pip install black~=23.3.0
	black --check --diff ./examples
	docker-image:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: Ensure the docker image works and can start.
	run: \|
	make container-test

Provide feedback