Setup Scala GitHub Action

A GitHub Action to install Java via Jabba and sbt.

• Configurable Java version: supports OpenJDK, GraalVM, Zulu and any other Java version that's installable via Jabba.
• The sbt command is installed using the sbt-extras launcher.
• For faster startup, the csbt command is installed using the Coursier-based sbt-extras launcher. This launcher does not work with all builds, only use csbt if you know what you are doing.

Usage:

In your GitHub Actions workflow, add a uses: declaration before calling the sbt command.

+++ .github/workflows/ci.yml
  name: CI
  on:
    push:
  jobs:
    build:
      runs-on: ubuntu-latest
      steps:
      - uses: actions/checkout@v1
+     - uses: olafurpg/setup-scala@v2
      - name: Compile
        run: sbt compile

The default Java version is the latest OpenJDK 8 HotSpot version via AdoptOpenJDK. To customize the Java version add a with: declaration. For example, to use the latest AdoptOpenJDK 11 version

+++ .github/workflows/ci.yml
  name: CI
  on:
    push:
  jobs:
    build:
      runs-on: ubuntu-latest
      steps:
      - uses: actions/checkout@v1
      - uses: olafurpg/setup-scala@v2
+       with:
+         java-version: adopt@1.11
      - name: Compile
        run: sbt compile

More Java version examples:

• graalvm@: the latest GraalVM
• openjdk@1.14: the latest OpenJDK 14 version
• zulu@1.11: the latest Zulu OpenJDK 11