Set config defaults for local development

[MaxSchaefer]

Some developers are currently running into the following errors in their local development environment.

• NEXT_PUBLIC_OAUTH_REDIRECT_URI=http://localhost:3000/auth/callback
  We can also try to move to a relative path instead of an absolute URL.
• Introducing the possibility of runtime environment variables
  All environment variables in https://github.com/helpwave/web/blob/main/tasks/utils/config.ts are set at build time. This is really inconvenient because we want to have some configuration options for staging and production.

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Hello @MaxSchaefer. When running the project in my local and visiting the localhost url it is redirecting me to https://staging-tasks.helpwave.de/auth/callback?fake_token=eyJzdWIiOiIxODE1OTcxMy01ZDRlLT[…]NDc5ODQiLCJlbWFpbCI6InRlc3RpbmUudGVzdEBoZWxwd2F2ZS5kZSJ9
Am I missing anything?

You can set the environment variable (/tasks/.env) NEXT_PUBLIC_OAUTH_REDIRECT_URI to http://localhost:3000/auth/callback.

Originally posted by @MaxSchaefer in #203 (comment)

[MaxSchaefer]

@JaninaWibker wanna take a look at this? Can Next.js 14 help us with runtime envs?