build: Add script to spin up a local Mosquitto broker

CONTRIBUTING.md

@@ -10,6 +10,7 @@ We're very happy about contributions to aiomqtt! ✨
 - Install the dependencies with `./scripts/setup`
 - Run black, ruff, and mypy with `./scripts/check`
 - Run the tests with `./scripts/test`
+- Spin up a local mosquitto broker via Docker with `./scripts/develop`
 
 ## The documentation
 

scripts/README.md

@@ -1,6 +1,7 @@
 # Development scripts
 
 - `check`: Format and lint the code with `black` and `ruff`; Use `--dry` option for dry run
+- `develop`: Spin up a local mosquitto broker via Docker
 - `docs`: Build the documentation; Use `--reload` option to serve locally with live reload
 - `setup`: Setup or update the dependencies after a `git clone` or `git pull`
 - `test`: Run the tests

scripts/develop

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+# Safety first
+set -o errexit -o pipefail -o nounset
+# Change into the project's directory
+cd "$(dirname "$0")/.."
+
+# Path to our Mosquitto configuration
+MOSQUITTO_CONFIGURATION="$(pwd)/scripts/mosquitto.conf"
+# Start a Mosquitto MQTT broker via docker
+docker run -it --rm --name mosquitto -p 127.0.0.1:1883:1883 -v "${MOSQUITTO_CONFIGURATION}:/mosquitto/config/mosquitto.conf" eclipse-mosquitto:latest

scripts/mosquitto.conf

@@ -0,0 +1,5 @@
+listener 1883
+protocol mqtt
+persistence false
+log_dest stderr
+allow_anonymous true