Put the things that are going to change as the last step; use very few steps (eg dont copy files one by one) and let Docker cache the results. We use WhaleWare

Put the things that are going to change as the last step; use very few steps (eg dont copy files one by one) and let Docker cache the results. We use WhaleWare as a templating tool: https://github.com/l3nz/whaleware https://github.com/l3nz/whaleware and it works great (or well enough)