Open up /logs in docker image

Dockerfile

@@ -11,9 +11,9 @@ RUN addgroup -g 1000 teklia && adduser -D -u 1000 -G teklia ark
 # Allow access to python egg cache
 RUN mkdir -p $PYTHON_EGG_CACHE && chmod a+rxw $PYTHON_EGG_CACHE
 
-# Allow access to medias
-RUN mkdir -p /medias/staging /medias/iiif
-RUN chown -R ark:teklia /medias
+# Allow access to medias and logs
+RUN mkdir -p /medias/staging /medias/iiif /logs
+RUN chown -R ark:teklia /medias /logs
 
 # Allow access to default logs dir
 RUN mkdir -p /logs && chmod a+rxw /logs