Map manjaro-arm platform

[iansltx]

Resolves #34318. Thx @jmwatts for the QA on this!

• QA'd all new/changed functionality manually

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.22%. Comparing base (89d675a) to head (73e674d).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #34357      +/-   ##
==========================================
- Coverage   64.23%   64.22%   -0.01%     
==========================================
  Files        2060     2060              
  Lines      207429   207430       +1     
  Branches     6935     7032      +97     
==========================================
- Hits       133247   133230      -17     
- Misses      63737    63750      +13     
- Partials    10445    10450       +5     

Flag	Coverage Δ
backend	65.35% <100.00%> (-0.01%)	⬇️
frontend	53.54% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[sgress454]

Cannot vouch for whether this fixes #34318 but looks completely reasonable from a standpoint of how we add known platforms to the codebase.