run-ci: remove --network=host

There shouldn't be any reason to expose the Docker container
directly on the host network.  The default in Docker is 'bridge'.

This was originally introduced in a commit that added CMake support
back in 2017 but with no explanation.  Removing it now...

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I6f7f218cd23b86d62efdadafa8e75c8a8615b4da
1 file changed