rootfs/chromiumos: fix hard-coded user in build_board.sh

Use the ${USERNAME} variable in build_board.sh rather than the
hard-coded "user" name.

Fixes: 4f4eea2 ("kernelci.rootfs: add support for building chromiumos images")
Signed-off-by: Guillaume Tucker <[email protected]>

Author: gctucker

config/rootfs/chromiumos/scripts/build_board.sh

@@ -19,7 +19,7 @@ trap cleanup EXIT
 
 echo "Preparing environment, branch ${BRANCH}"
 sudo mkdir chromiumos-sdk
-sudo chown user chromiumos-sdk
+sudo chown ${USERNAME} chromiumos-sdk
 cd chromiumos-sdk
 git config --global user.email "[email protected]"
 git config --global user.name "KernelCI Bot"