Add missing build file.

Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>

tests/build-in-docker.sh

@@ -0,0 +1,7 @@
+#!/bin/bash -eu
+
+source tests/docker_env.sh
+#run_in_docker rm -rf CMakeFiles
+run_in_docker mkdir -p build_in_docker
+run_in_docker -w "$PWD/build_in_docker" cmake -DENABLE_EMULATION=1 ..
+run_in_docker -w "$PWD/build_in_docker" make -j ${NUM_PROC}