GitLab

Set defaults for PLAT where needed

It is useful sometimes (e.g. in config.sh's pre_build') to do stuff based on
the current python version. The problem is that when running inside the docker
container the variable MB_PYTHON_VERSION is passed on only as PYTHON_VERSION
without the MB_ prefix, but in the macOS environment the latter is not
present. Thus, one needs to check both PYTHON_VERSION and MB_PYTHON_VERSION.
Better to pass both to the docker container, so one can jut check the value
of MB_PYTHON_VERSION on both mac and linux.

Note that the same hack is used in the 'install_run' function, where both
PYTHON_VERSION and MB_PYTHON_VERSION are passed through to docker run.

Nipy server's certificate is out of date, switch to using Rackspace
container instead.

* Add config.pre to override envvars used in `library_builders.sh`
Fixes part 2 of https://github.com/matthew-brett/multibuild/issues/116

* rename config_pre.sh to env_vars.sh as suggested

* Allow to specify a custom $CONFIG_PATH

* need to also pass  to the docker container

* Add config.pre to override envvars used in `library_builders.sh`
Fixes part 2 of https://github.com/matthew-brett/multibuild/issues/116

* rename config_pre.sh to env_vars.sh as suggested

* Allow to specify a custom $CONFIG_PATH

* need to also pass  to the docker container

Here, we pass both the USE_CCACHE variable and the CCACHE volume to docker.

Allow other build commands to Docker

BUILD_COMMIT not available directly from the repository, and may be useful for
later build steps.

Build / test Python versions conceptual separable in case of Linux
builds.