If you don't have a product yet, following "best practises" is not a good use of time, especially if there's no consumer facing impact and if it takes you twice as long to do it. Unless you are developing niche hardware or safety critical products, your first release must be quick. Time is the most valuable asset you have, don't waste it on formatting/linting/CI-CD at this stage. An early release puts your product in the market and allows you to get feedback from that point, which is quite valuable to an early stage startup.