bug 1218563: Document building/updating base img

[jgmize]

@jwhitlock r?

[codecov-io]

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[jwhitlock]

The instructions worked, but I missed the intent the first time. I ran the first instruction, then the second, and had my freshly-built base image replaced with the cloud version. Luckily, the local build was completely cached, so it was fast to recover.

Can you add a make up or similar in the middle, to signal how to recreate the containers with the fresh base image?

[jgmize]

updated with instructions to restart the containers to start using the newly built base image. Note that I explicitly documented docker-compose stop and docker-compose up -d as separate steps because I have seen issues with docker-compose restart and do not recommend it.

[jwhitlock]

Thanks @jgmize this is much better than the method I was using to use a locally-built image.