unixPB: Add non-Temurin jdk25 build for arm32 as trestle boot JDK

[sxa]

Ref: adoptium/adoptium#265 (comment)

This allows us to have a jdk25 that can be used as a bootstrap for a jdk26/jdk build:

 Version string: 26-beta+26-202511271822 (26-beta)
* Source date:    1764267722 (2025-11-27T18:22:02Z)

Tools summary:
* Boot JDK:       openjdk version "25-beta" 2025-09-16 OpenJDK Runtime Environment (build 25-beta+36-202511252229) OpenJDK Server VM (build 25-beta+36-202511252229, mixed mode, sharing) (at /usr/lib/jvm/jdk25)
* Toolchain:      gcc (GNU Compiler Collection)
* C Compiler:     Version 11.2.0 (at /usr/local/gcc11/bin/gcc-11.2)
* C++ Compiler:   Version 11.2.0 (at /usr/local/gcc11/bin/g++-11.2)

=JAVA VERSION OUTPUT=
openjdk version "26-beta" 2026-03-17
OpenJDK Runtime Environment (build 26-beta+26-202511281556)
OpenJDK Server VM (build 26-beta+26-202511281556, mixed mode, sharing)
=/JAVA VERSION OUTPUT=

Noting that it's running with

* Build jobs:     1

which should probably be fixed at some point (Noted in adoptium/temurin-build#4323 (comment))

Checklist

• commit message has one of the standard prefixes
• faq.md updated if appropriate
• other documentation is changed or added (if applicable)
• playbook changes run through VPC or QPC (if you have access) https://ci.adoptium.net/job/VagrantPlaybookCheck/2224/ Additional standalone testig has taken place and confirmed that the jdk25 boot jdk is in place and usable as a bootstrap for jdk26
• VPC/QPC not applicable for this PR
• for inventory.yml changes, bastillion/nagios/jenkins updated accordingly

Note: The JDK tarball that this is pulling was built locally by me (including the chain of 22->23->24) in the ubuntu1604_build_image container with GCC11.2.0.

[steelhead31]

Looks good.

[smlambert]

LGTM

[sxa]

Confirmed that this will successfully build a jdk26 as per the final java -version output which has now been added to the description, therefore merging.