feat: add a macos-15-intel runner

Author: baseplate-admin

.github/workflows/build-frontend.yml

@@ -21,7 +21,7 @@ jobs:
         runs-on: ${{ matrix.os }}
         strategy:
             matrix:
-                os: [ubuntu-latest,ubuntu-24.04-arm, windows-11-arm, windows-latest, macos-latest]
+                os: [ubuntu-latest,ubuntu-24.04-arm, windows-11-arm, windows-latest, macos-latest, macos-15-intel]
                 node-version: [latest]
 
         defaults: