Add --auth-response option and expose through entrypoint.sh

[wrmilling]

This pull request attempts the following two goals:

• Create a new --auth-response command line switch which takes in the responseUrl directly.
• Expose both --auth-files and --auth-response command line switches through the docker images as environment variables.

This is to support using the docker images as part of a helm release deployed to Kubernetes, given the inability to interact with the terminal as part of initial startup.

Please let me know if you have any questions and thank you for your consideration.

[abraunegg]

@wrmilling
Thanks for the PR, will review further when I have time.

In terms of when this PR will be merged into 'master', most likely after #1494 is merged. I would PR merge this before that change, however, I am too far along the journey to stop, merge, backtrack then revisit all the language change code.

[wrmilling]

Hello @abraunegg. thanks for throwing this on the next milestone.

I have been testing out these changes via a new docker image which can be found here. The changes include what is in this PR as well as building a multi-arch image for arm64+amd64. If the multi-arch image is of interest (as well as the automated building + pushing of the images), please let me know. I would be happy to spin up a new PR with just the image and/or ci+cd changes.

Also, if you are curious about the helm chart this is being used in, it is documented here.

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