CI: Refactor GHA workflow recipes. Naming things. #1

	name: Apache Kafka, Apache Flink, and CrateDB

	on:
	pull_request:
	branches: ~
	paths:
	- '.github/workflows/stack-kafka-flink.yml'
	- 'stacks/kafka-flink/**'
	- 'requirements.txt'
	push:
	branches: [ main ]
	paths:
	- '.github/workflows/stack-kafka-flink.yml'
	- 'stacks/kafka-flink/**'
	- 'requirements.txt'

	# Allow job to be triggered manually.
	workflow_dispatch:

	# Run job each night after CrateDB nightly has been published.
	schedule:
	- cron: '0 3 * * *'

	# Cancel in-progress jobs when pushing to the same branch.
	concurrency:
	cancel-in-progress: true
	group: ${{ github.workflow }}-${{ github.ref }}

	jobs:

	tests:
	runs-on: ${{ matrix.os }}

	strategy:
	fail-fast: true
	matrix:
	os: [ "ubuntu-latest" ]

	name: OS ${{ matrix.os }}
	steps:

	- name: Acquire sources
	uses: actions/checkout@v4

	- name: Run test program
	run: \|
	cd stacks/kafka-flink
	bash test.sh

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