RFR: 8254054: Pre-submit testing using GitHub Actions should not use the deprecated set-env command

[Erik Joelsson]

On Tue, 6 Oct 2020 06:39:55 GMT, Robin Westberg <rwestberg at openjdk.org> wrote:

> The `set-env` command was recently deprecated in favor of a different method of setting environment variables, due to a
> security vulnerability [1]. The vulnerability does not affect our usage of GitHub Actions, but we should nevertheless
> update to avoid the associated deprecation warnings.   [1]
> https://github.blog/changelog/2020-10-01-github-actions-deprecating-set-env-and-add-path-commands/

Marked as reviewed by erikj (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/518