Create a default complex_obs directory in the Docker image to allow mounting of the directory (#4845) (#4886)

Author: enyachoke

Dockerfile

@@ -120,6 +120,7 @@ RUN mkdir -p /openmrs/data/modules \
     && mkdir -p /openmrs/data/owa  \
     && mkdir -p /openmrs/data/configuration \
     && mkdir -p /openmrs/data/configuration_checksums \
+    && mkdir -p /openmrs/data/complex_obs \
     && chmod -R g+rw /openmrs
 
 # Copy in the start-up scripts