WIP: Parallelize macOS CI builds by splitting arm64 and x86_64 into separate jobs (#12562)

* Parallelize macOS CI builds by splitting arm64 and x86_64 into separate jobs

* fix shell errors

* Delete intermediate per-arch artifacts

.github/workflows/build_all.yml

@@ -58,23 +58,41 @@ jobs:
       os: ubuntu-24.04
       build-deps-only: ${{ inputs.build-deps-only || false }}
     secrets: inherit
-  build_all:
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-          - os: windows-latest
-          - os: ${{ vars.SELF_HOSTED && 'orca-macos-arm64' || 'macos-14' }}
-            arch: arm64
+  build_windows:
     # Don't run scheduled builds on forks:
     if: ${{ !cancelled() && (github.event_name != 'schedule' || github.repository == 'OrcaSlicer/OrcaSlicer') }}
     uses: ./.github/workflows/build_check_cache.yml
     with:
-      os: ${{ matrix.os }}
+      os: windows-latest
+      build-deps-only: ${{ inputs.build-deps-only || false }}
+      force-build: ${{ github.event_name == 'schedule' }}
+    secrets: inherit
+  build_macos_arch:
+    strategy:
+      fail-fast: false
+      matrix:
+        arch:
+          - arm64
+          - x86_64
+    # Don't run scheduled builds on forks:
+    if: ${{ !cancelled() && (github.event_name != 'schedule' || github.repository == 'OrcaSlicer/OrcaSlicer') }}
+    uses: ./.github/workflows/build_check_cache.yml
+    with:
+      os: ${{ vars.SELF_HOSTED && 'orca-macos-arm64' || 'macos-14' }}
       arch: ${{ matrix.arch }}
       build-deps-only: ${{ inputs.build-deps-only || false }}
       force-build: ${{ github.event_name == 'schedule' }}
     secrets: inherit
+  build_macos_universal:
+    name: Build macOS Universal
+    needs: build_macos_arch
+    if: ${{ !cancelled() && needs.build_macos_arch.result == 'success' && !inputs.build-deps-only && (github.event_name != 'schedule' || github.repository == 'OrcaSlicer/OrcaSlicer') }}
+    uses: ./.github/workflows/build_orca.yml
+    with:
+      os: ${{ vars.SELF_HOSTED && 'orca-macos-arm64' || 'macos-14' }}
+      arch: universal
+      macos-combine-only: true
+    secrets: inherit
   unit_tests:
     name: Unit Tests
     runs-on: ubuntu-24.04