Retored the code to main #11

	name: MQTTEx
	on: [push, pull_request]

	jobs:
	test:
	env:
	GOPATH: /home/runner/work/nats-server
	GO111MODULE: "on"
	runs-on: ubuntu-latest
	steps:
	- name: Checkout code
	uses: actions/checkout@v4
	with:
	path: src/github.com/nats-io/nats-server

	- name: Setup Go
	uses: actions/setup-go@v4
	with:
	go-version: 1.21

	- name: Install external test tools
	shell: bash --noprofile --norc -x -eo pipefail {0}
	run: \|
	wget https://github.com/hivemq/mqtt-cli/releases/download/v4.20.0/mqtt-cli-4.20.0.deb
	sudo apt install ./mqtt-cli-4.20.0.deb
	# <>/<> FIXME: use @latest
	go install github.com/ConnectEverything/mqtt-test@36762e7b1c50335f56d9560dda218115e7b475c6

	- name: Test and benchmark
	shell: bash --noprofile --norc -x -eo pipefail {0}
	run: \|
	cd src/github.com/nats-io/nats-server
	go test -v --run='MQTTEx' --bench 'MQTTEx' --benchtime=100x ./server \| tee /tmp/current-bench-result.txt

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