[orf]

Oh right, sorry, I thought it was obvious that you have to 'rebuild' the image when a code changes. But if you have a "COPY src/ /app" as the last command in your dockerfile then that's not an expensive operation as all the previous ones are cached.

Unless you change your system packages or add a new line to your requirements.txt, in which case the cache would be invalidated and the build takes longer.

But... it's done by your CI server anyway, so...