Always clean Travis CI cache if build fails

.travis.yml

@@ -13,6 +13,10 @@ before_script:
   - sudo service mysql stop
   - sudo service postgresql stop
 
+# Clean the cache if any step fails.
+after_failure:
+  - scripts/ci clean
+
 cache:
   timeout: 1000
   directories:

scripts/ci

@@ -45,7 +45,7 @@ clean_cache() {
 
 
 quay_run() {
-    docker run --net=host --entrypoint "/bin/bash" -e TEST_DATABASE_URI -ti "${IMAGE}:${IMAGE_TAG}" -c "$*"
+    docker run --net=host -e TEST_DATABASE_URI -ti "${IMAGE}:${IMAGE_TAG}" "$@"
 }