run-unit-test-docker: support podman

podman requires this env variable be set in order to have the correct
permissions to mount your home filesystem.

Tested:
- Verified after the latest sdbusplus updates that this script can now
  run on a POWER9 based server using RH8 + podman

Change-Id: I32a9e68f8cfc5df1d4489a2e089ab3ba92558cc9
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
1 file changed