[jdk11u-dev] RFR: 8253424: Add support for running pre-submit testing using GitHub Actions

[Christoph Langer]

This is the backport of the GitHub Actions workflow to JDK11 Updates

-------------

Depends on: https://git.openjdk.java.net/jdk11u-dev/pull/187

Commit messages:
 - GitHub Actions for JDK11 Updates

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/189/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=189&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8253424
  Stats: 1546 lines in 2 files changed: 1546 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/189.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/189/head:pull/189

PR: https://git.openjdk.java.net/jdk11u-dev/pull/189