forked from Docker/baseimage-docker
While COPY and ADD are essentially interchangeable here, it is still considered good practice to use COPY whenever possible. From the docker docks on best practices: "Although ADD and COPY are functionally similar, generally speaking, COPY is preferred. That’s because it’s more transparent than ADD. [...] For other items (files, directories) that do not require ADD’s tar auto-extraction capability, you should always use COPY." Additionally, ADD commands were not cached prior to 0.7.3 (which was released on 2013-01-02).