Handle Bazel startup options in bazel-docker script.
Handle Bazel startup options in bazel-docker script.

This also updates the is_rootless check to handle Podman and for the Docker command to be overridden using the DOCKER environment variable.

Bug: 168619301
Change-Id: I250ae22498d0e527aea3ec7e69addd00452306a7

world-federation-of-advertisers/cross-media-measurement,world-federation-of-advertisers/cross-media-measurement,world-federation-of-advertisers/cross-media-measurement