Custom environment options

[silvertech-daniel]

I want to use this but my understanding from

vercel-azure-devops-extension/vercel-deployment-task-source/src/index.ts

Line 184 in d23aa66

`--environment=${deployToProduction ? "production" : "preview"}`,

is that there is no corresponding option to ensure that the vercel pull environment is the same as the target.

I think there should there be 4 variables (production, environment, pullEnvironment, and target):

• with production treated as a shortcut to set environment to "production"
  • throw an error if production and any of the other variables are set at the same time
• pullEnvironment/target default to environment
• --prod set if target resolves to "production"

The interactions between this task's options and the vercel cli's options are confusing to me, so let me know if this doesn't make sense.

Extracted into a new issue from #46 (comment)

[general-adhoc]

The updated readme from @phidol's commit detail how to do this.

For example, if you had a custom environment "custom-test", you could set target: custom-test as a task input and it will deploy to the custom-test environment (set production: false)