build: support TLS for UI and Server with `make start`

[MasonM]

Motivation

This was split off from https://github.com/argoproj/argo-workflows/pull/13609 to make it easier to review. This adds a new make start UI_SECURE=true flag that can be used to test Argo with a TLS termination proxy in front, which is needed for testing bugs like https://github.com/argoproj/argo-workflows/issues/13031. Also, make start SECURE=true UI=true was broken, so I fixed that too.

Modifications

• Update the proxy option in ui/src/app/webpack.config.js to use the new array syntax (docs). The old object syntax is deprecated and was removed in https://github.com/webpack/webpack-dev-server/pull/4694
• Fixed ui/src/app/webpack.config.js to respect the ARGO_SECURE variable when determining the proxy endpoint
• Added UI_SECURE variable to Makefile and have ui/src/app/webpack.config.js use it to set the server option (docs).
• Updated dev/nix/conf.nix to pass the same variables as Makefile. I didn't test this.
• Updated docs/running-locally.md with information on the SECURE/UI_SECURE flags. Also, I added a section on debugging, since it took me some time to figure this out.

Verification

Tested the following combinations and ensured the workflow list rendered properly each time:

1. make start UI=true
2. make start UI_SECURE=true
3. make start UI_SECURE=true SECURE=true
4. make start UI=true SECURE=true

Screenshot with make start UI_SECURE=true:

[MasonM]

@isubasinghe Okay, I pushed d507aa638dd351c8b802b175defe85502c306c52 to add a hack/update-sso-redirect-url.sh script that rewrites the redirectUrl automatically. It's messy, but I can't think of a better solution.

[MasonM]

@agilgur5 Thanks for the review!

Makes sense though I don't think I've seen a deprecation warning on this? Are we on an older version?

Yes, we're on webpack-dev-server v4.15.1: https://github.com/argoproj/argo-workflows/blob/bf7760a46e29bf2571bd3e9d852220b44339bb60/ui/yarn.lock#L10063-L10064

and https://github.com/webpack/webpack-dev-server/commit/d7643251db183a00f277e76a640bad3ef77c2a8e was released in webpack-dev-server v5.0.0