Commits on Jan 24, 2021

1. [manylinux2014] Rework scripts to be more docker cache friendly …

   This won't change travis-ci build time (at least for now) but allows maintainers/contributors to benefit from docker caching for local developments (faster builds at the expense of higher disk usage)
   
   Round 1
   
   Use docker multi-stage build to build the manylinux image in 3 steps:
   
   1. runtime_base: this image has all the necessary bits that are common to the build_base image and the manylinux image. This includes system packages required for runtime, the gcc toolchain & some basic tools.
   
   2. build_base: this image builds all the remaining tools required for the manylinux image. Any tool requiring specific system development package not required in the manylinux image shall be built from this image. For tools that used to be installed in /usr/local, they are staged in /manylinux-rootfs for an easy copy in the third stage.
   
   3. manylinux: This image uses the runtime_base image as a base image. Tools built in the 2nd step are copied directly in the final filesystem. A finalization script is then run to install the remaining python tools/dependencies and run checks.

   

   mayeut committed Jan 24, 2021
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