RFR: More on testing

[David Holmes]

On Mon, 20 Feb 2023 15:32:04 GMT, Jesper Wilhelmsson <jwilhelm at openjdk.org> wrote:

> * Added clarifications and expectations around testing and review
> * Moved GHA section (unchanged)
> * Removed outdated stuff from the glossary

src/guide/testing-the-jdk.md line 174:

> 172: ## GitHub actions
> 173: 
> 174: GitHub has a feature called **GitHub actions** (GHA) that can be used to automate testing. The GHA is executed whenever a push is made to a branch in your repository. The bots will show the results of the GHA in your PR when you create or update it. The GHA in the JDK project is configured to run a set of tests that is commonly known as **tier 1**. This is a relatively fast, small set of tests that tries to verify that your change didn't break the JDK completely. In tier 1 the JDK is built on a small set of platforms including (but not necessarily limited to) Linux, Windows, and MacOS, and a few tests are executed using these builds.

GHA also does a whole bunch of cross-compilation builds for PPC, ARM and S390.

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PR: https://git.openjdk.org/guide/pull/98