Debugging build locally with Docker

You can debug a build locally by pulling down a Docker image that is held in the documentation link, Troubleshooting Locally in a Docker Image (https://docs.travis-ci.com/user/common-build-problems/#Troubleshooting-Locally-in-a-Docker-Image). You can find the instructions to install Docker in this link (https://docs.docker.com/install/).

1. Pull down the Go Docker image:

docker pull travisci/ci-garnet:packer-1512502276-986baf0

Notice that we run the docker pull command to actually pull down the Docker image

2. Start the interactive Docker session:

Notice here that we ran an interactive shell session in detached mode

3. Open a login shell in the running container:

docker exec -it travis-debug bash -l

This command starts an interactive shell session with the running Docker container using a Bash shell

4. Switch to the Travis user:

su - travis

In...