ci: avoid interleaving output from different sharness tests

The `-O` option causes make to print out all the output from a single target all
at once. This will make the test log readable again.

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>

.circleci/config.yml

@@ -72,7 +72,7 @@ jobs:
     - *make_out_dirs
     - *restore_gomod
 
-    - run: make -j 10 coverage/sharness_tests.coverprofile test/sharness/test-results/sharness.xml TEST_GENERATE_JUNIT=1 CONTINUE_ON_S_FAILURE=1
+    - run: make -O -j 10 coverage/sharness_tests.coverprofile test/sharness/test-results/sharness.xml TEST_GENERATE_JUNIT=1 CONTINUE_ON_S_FAILURE=1
 
     - run:
         when: always