Add support for downloading and running JDK builds

[BlueGoliath]

Description:
Add an option to set a URL for a JDK build which setup-java will use to download, uncompress, and run per arch.

Justification:
I often use unreleased Java versions not supported by this plugin(e.g. Java 22) and would like to use it.

[v-HarithaVattikuti]

Hello @BlueGoliath
Thank you for creating this feature request. We will investigate it and get back to you as soon as we have some feedback.

[brunoborges]

@HarithaVattikuti any update on this issue? It would potentially address other needs as well.

[brunoborges]

This use case is already supported today via the jdkfile distribution, without needing a dedicated URL input.

You can download the JDK in a prior step and point setup-java at the archive with the jdkFile input — setup-java then handles extraction, installation, caching, and JAVA_HOME setup:

steps:
- run: |
    download_url="https://github.com/adoptium/temurin22-binaries/releases/download/jdk-22%2B36/OpenJDK22U-jdk_x64_linux_hotspot_22_36.tar.gz"
    wget -O $RUNNER_TEMP/java_package.tar.gz $download_url
- uses: actions/setup-java@v5
  with:
    distribution: 'jdkfile'
    jdkFile: ${{ runner.temp }}/java_package.tar.gz
    java-version: '22'
    architecture: x64
- run: java --version

This is exactly the scenario you described — using unreleased / Early Access Java versions not yet provided by setup-java. The only difference from the original request is that the download happens in a workflow step (a single wget/curl line) rather than setup-java fetching the URL itself, which also gives you full control over architecture selection.

This is documented in Installing Java from local file, which also shows a variant that auto-fetches the latest JDK at runtime.

Given the need is fully met by the existing jdkfile feature, I'm closing this issue. I'll also add a note to the advanced docs calling out the Early Access use case explicitly. If you'd prefer a native jdkUrl input where setup-java does the download itself, feel free to open a separate feature request for that specific enhancement.