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I am very new to Docker and MQTT but aware of what they do. As a retired IT exec I never had to actually work setting up development environments or configure systems and networks. I am starting some automation projects involving remote sensors and LoRa/ESP32 and need MQTT. I am using a synology NAS/Docker and need to import a docker image. I download same from github and unzipped the file. What I don’t know is which file/image is the correct docker file. Can you help me?