[Actions] Add new builds for testing

[VeithMetro]

No description provided.

[Copilot]

Pull request overview

Adds an additional Linux CI build variant intended for test-related artifacts by extending the reusable Linux build matrix and aligning artifact naming/flags for that new variant, plus updates the upstream Thunder reusable workflow reference to a branch that likely provides the corresponding artifacts.

Changes:

• Extend the Linux build template matrix with a new tests64 “architecture” entry and adjust job/artifact naming accordingly.
• Ensure compiler -m flags remain valid for tests64 by mapping it to -m64.
• Update the Linux pipeline to use a different ref of the Thunder reusable workflow that presumably publishes the new -test artifacts.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
.github/workflows/Linux build template.yml	Adds tests64 to the build matrix and updates naming/flags/artifact naming to support it.
.github/workflows/Build ThunderInterfaces on Linux.yml	Updates the referenced Thunder reusable workflow ref to a branch likely containing the needed test-artifact behavior.

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[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.