Allow to add additional binds to Docker build container (#7684)
* Allow to add additional binds to Docker build container
Sometimes it might be necessary to add additional binds to the build
container, e.g. to add SSH keys for the docs user to clone private
repositories or for caches. These additional binds can be specified
as field in settings:
RTD_DOCKER_ADDITIONAL_BINDS = {
'/home/docs/.ssh': {
'bind': '/home/docs/.ssh',
'mode': 'ro',
}
}