Ubuntu (Nix) container no longer needs to source the Nix initialization script (#1819)
@meteorcloudy, I tested this by running the failing BuildKite invocation
locally, with all the volumes/environment variables stripped out and
ensuring it made it into `bazelci.py`. My previous test used `docker run
-it --rm gcr.io/bazel-public/ubuntu2204-nix` which gave me a login shell
that sourced `~/.bashrc`, whereas the direct `docker run` invocation
with `/bin/sh -e -c <command>` evidently skips that.
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