BHP1-1645 Add test build workflow (dev/prod VMS, test signing, no release)

[rjsheperd]

Purpose

Copy of release.yml for creating a JAR + desktop executables from any
branch/tag/SHA without creating a release.

Related Issues

Closes BHP1-1645

Submission Checklist

• Included Jira issue in the PR title (e.g. BHP1-### <title>)
• Code passes linter rules (clj-kondo --lint components/**/src bases/**/src projects/**/src)
• Feature(s) work when compiled (clojure -M:compile-cljs)

Testing

1. Github Actions > Select Test Build (no release) > Run workflow
   with the main branch, VMS dev, Windows ticked.
2. Run completes; no new entry under Releases.
3. Download the behave-*-dev-vms artifact: it holds the versioned JAR and a
   signed Windows zip. java -jar the JAR — it boots with the dev VMS layout.
4. Repeat with VMS prod; the JAR boots with the prod layout.