RFR: 8206311: Add docs-javase, docs-reference to CI build

[Magnus Ihse Bursie]

On Wed, 9 Sep 2020 22:50:52 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

> Reposting this review as PR.
> 
> In order to regularly build the javase and reference docs images, I have made the following changes:
> 
> 1. Introduced bundle targets for the javase and reference docs images.
> 2. To run this in CI without adding more unnecessary build time to the linux-x64 target (where the current docs are
> built), I created a new jib profile "docs". This will run in a separate task and will build all 3 docs targets. 3. To
> enable the docs targets to run standalone without having to build a full JDK, I had to tweak the "build-jdk" concept a
> bit, to allow it to also function when not cross compiling for certain parts of the build. Specifically the
> buildtools-modules can now be built by a "build-jdk" instead of the exploded image. 4. For symmetry, I renamed
> variables and targets involving docs images to always include one of "jdk", "javase" or "reference" in the name. See
> below for targets.  The new top level targets are:  docs-{jdk.javase,reference}-image:
> Aliases for the existing docs-{jdk,javase,reference} added for consistency. The old docs-image is now an alias for
> docs-jdk-image.
> all-docs-images:
> Builds all 3 of the above docs images.
> 
> docs-{jdk,javase,reference}-bundles:
> Builds the bundles for each kind of docs image. The existing docs-bundles is now an alias for docs-jdk-bundles.
> 
> all-docs-bundles:
> Builds all the docs bundles.

Marked as reviewed by ihse (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/99