Store test results as artifacts

Adjust the test commands to store the test results as XML, which are
then stored as test results.

.circleci/config.yml

@@ -60,7 +60,22 @@ jobs:
 
       - run:
           name: Test Code
-          command: docker run --entrypoint "/app/.local/bin/coverage" fx-private-relay run --source=. -m pytest --cov=./ --cov-fail-under=60
+          command: |
+            mkdir -p /tmp/test-results
+            mkdir -p /tmp/test-results/coverage
+            mkdir -p /tmp/test-results/pytest
+            chmod a+rwx /tmp/test-results
+            chmod a+rwx /tmp/test-results/coverage
+            chmod a+rwx /tmp/test-results/pytest
+            docker run \
+              --entrypoint "/bin/bash" \
+              -v /tmp/test-results:/tmp/test-results \
+              fx-private-relay \
+              -c \
+              '/app/.local/bin/coverage run --source=. --branch -m pytest --cov=./ --cov-fail-under=60 --junitxml=/tmp/test-results/pytest/results.xml && /app/.local/bin/coverage xml -o /tmp/test-results/coverage/results.xml'
+
+      - store_test_results:
+          path: /tmp/test-results
 
   deploy:
     docker: