Adding tests repository to CI/CD pipeline

Change-Id: I7ec51ef7e3e3d1a5c111c9678205a425b81e148b
Signed-off-by: Felipe Vicens <felipe.vicens@atos.net>
diff --git a/docker/Makefile b/docker/Makefile
index f2c4ec7..a3b4028 100644
--- a/docker/Makefile
+++ b/docker/Makefile
@@ -14,5 +14,5 @@
 #   See the License for the specific language governing permissions and
 #   limitations under the License.
 #
-SUBDIRS = MON NBI osmclient RO LCM light-ui POL Keystone NG-UI PLA
+SUBDIRS = MON NBI osmclient RO LCM light-ui POL Keystone NG-UI PLA tests
 include mk/dirs.mk