Remove testing code

Author: andrjohns

.github/workflows/main.yml

@@ -5,7 +5,7 @@ on:
   pull_request:
     branches: [ develop, master ]
   push:
-    branches: [ develop, winarm64-ci ]
+    branches: [ develop ]
     paths-ignore:
       - 'doygen/**'
       - 'hooks/**'
@@ -26,7 +26,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [windows-11-arm]
+        os: [windows-11-arm, ubuntu-24.04-arm]
         config: [
           { label: misc, tests: 'test/unit/*_test.cpp test/unit/math/*_test.cpp test/unit/math/memory' },
           { label: prim, tests: 'test/unit/math/prim' },
@@ -77,7 +77,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [windows-11-arm]
+        os: [windows-11-arm, ubuntu-24.04-arm]
         group: [1, 2, 3, 4, 5]
 
     steps: