sbt-typelevel-github-actions: JobEnvironment prevents templating url

[kubukoz]

Currently, JobEnvironment requires a java.net.URL, which seems to prevent certain usecases such as templating based on a step output - e.g. as in https://docs.github.com/en/pages/getting-started-with-github-pages/using-custom-workflows-with-github-pages.

I think a variant should be added that allows passing an arbitrary string that doesn't get parsed as a URL.

[Supriya-57]

According to me modify JobEnvironment to accept both URL and String values.

Steps to Fix:
Introduce an alternative constructor that takes a raw string instead of a java.net.URL.
Modify internal handling to support both URL validation (when needed) and raw string inputs.
Ensure backward compatibility with existing code that already uses URL.

import java.net.URL

sealed trait JobEnvironment {
def value: String
}

final case class UrlEnvironment(url: URL) extends JobEnvironment {
override def value: String = url.toString
}

final case class StringEnvironment(rawValue: String) extends JobEnvironment {
override def value: String = rawValue
}

object JobEnvironment {
def fromURL(url: URL): JobEnvironment = UrlEnvironment(url)
def fromString(value: String): JobEnvironment = StringEnvironment(value)
}