feat: Added the ablity to select target architecture for linux builds

[e-lisa]

---

PR Submission Checklist for internal contributors

• The PR Title

  • [x] conforms to the style of semantic commits messages¹ supported in Wire's Github Workflow²
  • [ ] contains a reference JIRA issue number like SQPIT-764
  • [x] answers the question: If merged, this PR will: ... ³

• The PR Description

  • [x] is free of optional paragraphs and you have filled the relevant parts to the best of your ability

---

What's new in this PR?

Issues

Cannot select build architecture for Linux builds.

Causes (Optional)

Build script does not allow for setting of the build architecture, it is hard-coded to "x64"

Solutions

Allow architecture to be specified at the command-line via a new variable $ARCH. Possible values for ARCH are documented here: https://www.electron.build/electron-builder.enumeration.arch

[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud