docker: install `mkisofs` to worker container

x86 targets allow the creation of ISO images, however this is not
possible because the `mkisofs` is missing. Install it.

Signed-off-by: Paul Spooren <mail@aparcar.org>

diff --git a/docker/buildworker/Dockerfile b/docker/buildworker/Dockerfile
index fdbae1fdaa51e2d4cfcf6f17656f7e2531d85a04..5219f92e0f50fa08fadecc5576b6c7d6216e0a6a 100644 (file)
--- a/docker/buildworker/Dockerfile
+++ b/docker/buildworker/Dockerfile
@@ -19,6 +19,7 @@ RUN \
                curl \
                gawk \
                gcc-multilib \
+               genisoimage \
                git-core \
                gosu \
                libdw-dev \