tree b7b2174c35eb1b954058fc793c22acb2fc892eb3
parent 95ec11828cc795a1b4dc61715c00e786bcbb5ec0
author Joel Stanley <joel@jms.id.au> 1541040590 +1030
committer Joel Stanley <joel@jms.id.au> 1541040677 +1030

ci: Fix environment variable check

The check for the variables were passing even tho they were not set,
resulting in bad syntax in the docker file:

 ENV DL_DIR
 ENV CCACHE_DIR '
 + docker build --network=host -t openpower/op-build-ubuntu1604 -
 Sending build context to Docker daemon   2.56kB
 Error response from daemon: ENV must have two arguments

I am no bash guru; this test is what is recommended by the first hit on
stackoverflow. Improve it if you know better.

Signed-off-by: Joel Stanley <joel@jms.id.au>