Missing newline

Author: hattne

.dev/docker/make_tests.dockerfile

@@ -26,4 +26,4 @@ RUN cd /app/cbflib && \
   conda activate test && \
   make tests 2>&1 | tee test.out
 
-RUN ! grep -a ignored /app/cbflib/test.out
+RUN ! grep -a ignored /app/cbflib/test.out