build: Update README.adoc [skip ci]

README.adoc

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 = Helloworld in Swift
 
+ifdef::env-github[]
+:tip-caption: :bulb:
+:note-caption: :information_source:
+:important-caption: :heavy_exclamation_mark:
+:caution-caption: :fire:
+:warning-caption: :warning:
+endif::[]
+
 This repository shows how to configure link:https://github.com/features/actions[GitHub Actions] and link:https://jreleaser.org/[JReleaser] to:
 
  * compile a helloworld app for the following targets:
    ** macos-x86_64
    ** linux-x86_64
  * assemble zip distributions with JReleaser
  * create rolling early-access releases with JReleaser on every push to `main` branch
+
+IMPORTANT: JReleaser requires 2 additional inputs that may be set as environment variables, `JRELEASER_PROJECT_VERSION` and `JRELEASER_GITHUB_TOKEN`. 
+More information about environment variable configuration may be found in the link:https://jreleaser.org/guide/latest/reference/environment.html[guide].