Discussion: after-build section

[mtsokol]

Hi!
What is your opinion on an after-build section feature, similar to before-build?

One usecase that I have is for linux builds (which use docker image). before-build is used to properly setup ccache cache directory, like here in MLIR Python bindings nightly wheels. It installs ccache inside the docker image and moves external cache directory into the container (This approach is explained in #1030).

But then when we want to persist the cache after the build finishes user needs a separate GitHub action step to move new cache out of the docker image: link.

I think that managing cache could be done in before-build and after-build sections by running proper sh files, instead of relying on before-build script and a separate GitHub action step. This is not only more coherent but also allows user to reproduce the build process locally.

WDYT? Would you accept after-build section?