build-unit-test-docker: move homedir with usermod

When the uid already exists, we do a usermod instead of a useradd,
but this does not create the new home directory.  We need to pass
the `-m` argument in order to move the old home directory to the
new location.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I9f2cabe982af0b09d3c3f65dcd3a0acb6b8f3591
1 file changed