cloudamqp/lavinmq-action is an composite run steps action that starts LavinMQ in the GitHub Actions VM with the default guest/guest user/password. You can then connect to the broker using the address found in environment variable AMQP_URL.
jobs:
build:
runs-on: ubuntu-latest
steps:
- uses: cloudamqp/lavinmq-action@main
- run: <your test command>