Move Redis to a nonstandard port

[jsf9k]

🗣 Description

This pull request:

1. Modifies the Docker composition so that the external port for Redis is no longer the standard value of 6379 (if the ports section of the redis service is uncommented).
2. Alphabetizes the key-value pairs in the ports section by key.
3. Adds a host_ip key to the ports dictionary to restrict Redis access to only the Docker host.

💭 Motivation and context

1. The Admiral uses and exposes its own instance of Redis, so by changing to a different port we avoid a conflict where both compositions attempt to use the same port.
2. Alphabetization is next to godliness.
3. Even when the ports dictionary is uncommented, the exposed port is only used for debugging purposes from the Docker host; therefore, it only makes sense to listen for local traffic.

🧪 Testing

All automated tests pass. I also started up the redis service with the ports dictionary uncommented and verified that redis-cli functions as expected from the Docker host.

✅ Pre-approval checklist

• This PR has an informative and human-readable title.
• Changes are limited to a single goal - eschew scope creep!
• All relevant type-of-change labels have been added.
• I have read the CONTRIBUTING document.
• These code changes follow cisagov code standards.
• All new and existing tests pass.

✅ Post-merge checklist

• Create a release.

[dav3r]

👍 with one suggestion that you may take or leave.

[mcdonnnj]

Seems reasonable enough.