A physical button, which once pressed does a deployment either locally or to the server. One click - Local, Two clicks - Server
Sort of like this -> https://flic.io/?utm_source=ppc&utm_campaign=xmas16&utm_content=1&gclid=Cj0KEQiAsrnCBRCTs7nqwrm6pcYBEiQAcQSznIe79cks0edcxAGsz1sWm9gFnB7lyay0cmVTeWrhbj0aApKG8P8HAQ