Add docker compose support, make documentation

[pkarman]

Purpose

These changes add Docker Compose support to allow for local development consistent with the deployed environment. In theory, this would allow for deployment into alternate cloud platforms.

Changes

• add documentation to the Makefile
• add new make targets
• add Dockerfile.api and docker-compose.yml

See also

MyFriendBen/benefits-api#1216

[anth-volk]

Thanks for this @pkarman! One minor change suggested. Otherwise, this should be good to go, but would appreciate if you wouldn't also mind updating the documentation at config/README.md to describe how a user might set the specified environment variables within a Docker compose-driven workflow.

[anth-volk]

suggestion: You should be able to remove this. This API doesn't use workers at all and never has, that's only our internal REST API.

[pkarman]

Thanks for this @pkarman! One minor change suggested. Otherwise, this should be good to go, but would appreciate if you wouldn't also mind updating the documentation at config/README.md to describe how a user might set the specified environment variables within a Docker compose-driven workflow.

Sure thing. I added a note to config/README.md and another to README.md

The tl;dr is: config works much the same way, with the added convenience of creating a local .env file when using docker compose.

[anth-volk]

@pkarman apologies for the radio silence on this, I lost track of it over the holidays. I've added a couple minor changes and also opened a new PR at #1185, as the testing flow we use requires tokens that unfortunately can't be shared via forks. I'm going to close this PR, then get the new one over the line. Thanks for all of your contributions on this.