RFR: Add experimental GitHub action

[Robin Westberg]

Hi all,

Please review this change that enables a GitHub action for experimental purposes.

Best regards,
Robin

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Commits:
 - e31490d7: Add experimental GitHub action

Changes: https://git.openjdk.java.net/skara/pull/212/files
 Webrev: https://webrevs.openjdk.java.net/skara/212/webrev.00
  Stats: 20 lines in 1 file changed: 20 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/skara/pull/212.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/212/head:pull/212

PR: https://git.openjdk.java.net/skara/pull/212