Add support for multiple API URLs in Docker image

[phss]

Description

The API_URLS environment variable can be used to run the Docker image with multiple URLs.

Example:
docker run -p 80:8080 -e API_URLS=[{name:"First API", url:"http://firstapiurl"},{name:"Second API", url:"http://secondapiurl"}] swaggerapi/swagger-ui

Motivation and Context

Currently, there's no way to run the Docker container using multiple URLs, as specified in https://github.com/swagger-api/swagger-ui/blob/master/docs/usage/configuration.md

This follows the same pattern of variable substitution to replace url by urls with the value of $API_URLS

How Has This Been Tested?

Started up Docker locally with and without the API_URLS environment variable, to check it still works as expected.

Types of changes

• No code changes (changes to documentation, CI, metadata, etc)
• Dependency changes (any modification to dependencies in package.json)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[willejs]

@shockey any thoughts on this?

[shockey]

CC: #3902

This seems alright to me. I'm not super excited by passing raw JSON through env vars, but it is the most direct way to do it.

[shockey]

thanks, @phss! this will go live tonight 😄

[shockey]

Working example in zsh:

docker run -p 80:8080 -e "API_URLS=[{name:\"Petstore\", url:\"http://petstore.swagger.io/v2/swagger.json\"},{name:\"USPTO\", url:\"https://raw.githubusercontent.com/OAI/OpenAPI-Specification/master/examples/v3.0/uspto.yaml\"}]" swaggerapi/swagger-ui

[yscialom]

As of v3.24.2, this feature is not available anymore.