Drop into a new shell environment with the same variables defined in a systemd
unit file (for debugging purposes).
Change-Id: Iaf513809b524f3f3e845b512450da71694bb7c7f
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7308
Autosubmit: wpcarro <wpcarro@gmail.com>
Reviewed-by: wpcarro <wpcarro@gmail.com>
Tested-by: BuildkiteCI
