The caching part is (mostly) generally fixable by making sure to always add your source code in two stages - dependency files first, then resolve dependencies,

The caching part is (mostly) generally fixable by making sure to always add your source code in two stages - dependency files first, then resolve dependencies, and the rest of the source code later. Rarely is this done though. And definitely alpine+musl doesn't always do what you might expect, and it's often language dependent as to whether or not you'll encounter something strange (not to mention you forfeiting bash)