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[WIP] Transports CI cache to/from a docker build process.
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This little hackery should let you achieve granular caching when building Docker image… While Docker’s built-in caching mechanism operates at a layer level (“layer caching”), many build tools can perform “granular caching” at a file-level. For example, in a big project, each source file may be compiled into intermediate files (e.g. object files) before being linked/bundled into a final build product. It is often the case that the compilation phase, rather than the bundling phase, takes the most time.
- Without granular caching, if you change a single file, you have to recompile everything.
- With granular caching, if you change a single file, you only have to recompile that file.