Extract a build artifact via docker cp

[refs #f2c17c9ea522]

Author: jfahrer

.circleci/config.yml

@@ -21,3 +21,5 @@ jobs:
       - run:
           name: Running the test suite
           command: ./scripts/run-specs.sh
+      - store_artifacts:
+          path: /tmp/artifacts

docker-compose.ci.yml

@@ -4,3 +4,4 @@ services:
   app:
     build:
       context: .
+    command: tail -f /dev/null

scripts/run-specs.sh

@@ -1,2 +1,14 @@
 #!/bin/bash
-docker-compose run app bundle exec rspec
+set -e
+function copy_artifacts {
+  mkdir -p /tmp/artifacts
+  CONTAINER_ID=$(docker-compose ps -q app)
+  docker cp ${CONTAINER_ID}:/tmp/rspec.xml /tmp/artifacts/rspec.yml
+}
+
+docker-compose up -d app
+docker-compose exec app \
+  bundle exec rspec --format progress --format RspecJunitFormatter --out /tmp/rspec.xml
+STATUS=$?
+copy_artifacts
+exit ${STATUS}