Simplify exit code retrieval for Docker container

Author: kriscfoster

docker_compose_test/docker_compose_test.sh

@@ -72,10 +72,8 @@ echo "$docker_compose_up_cmd" | bash
 result=$?
 
 # Figure out the exit code of the test container incase it never actually started.
-docker_inspect_cmd="$(docker inspect $($docker_compose_bin -f $ABSOLUTE_COMPOSE_FILE_PATH ps -qa $DOCKER_COMPOSE_TEST_CONTAINER) --format='{{.State.ExitCode}}' 2>/dev/null)"
-echo "running: $docker_inspect_cmd"
-echo EXIT_CODE=$("$docker_inspect_cmd" | bash)
-
+EXIT_CODE="$(docker inspect $($docker_compose_bin -f $ABSOLUTE_COMPOSE_FILE_PATH ps -qa $DOCKER_COMPOSE_TEST_CONTAINER) --format='{{.State.ExitCode}}' 2>/dev/null)" | bash
+echo "EXIT_CODE: $EXIT_CODE"
 if [ "$EXIT_CODE" != "0" ] || [ -z "$EXIT_CODE" ]; then
   echo "Error: $DOCKER_COMPOSE_TEST_CONTAINER container failed or never started!"
   exit 1