CI setup tweaks

Author: IanButterworth

.github/workflows/ci.yml

@@ -17,24 +17,27 @@ concurrency:
 
 jobs:
   test:
-    name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
+    name: julia -t${{ matrix.threads}} - ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
     runs-on: ${{ matrix.os }}
     timeout-minutes: 30
     strategy:
       fail-fast: false
       matrix:
-        version:
-          - 'nightly'
-        os:
-          - ubuntu-latest
-          - windows-latest
-        arch:
-          - x64
-          - x86
-        include:
-          - os: macOS-latest
+        threads:
+          # - '1'
+          - '4,4'
+        version: [nightly]
+        os: [ubuntu-latest, windows-latest, macOS-latest]
+        arch: [x64, x86, aarch64]
+        exclude:
+          - os: ubuntu-latest
+            arch: aarch64
+          - os: windows-latest
             arch: aarch64
-            version: 'nightly'
+          - os: macOS-latest
+            arch: x64
+          - os: macOS-latest
+            arch: x86
     steps:
       - uses: actions/checkout@v4
       - uses: julia-actions/setup-julia@v2
@@ -45,7 +48,7 @@ jobs:
       - uses: julia-actions/julia-runtest@v1
         env:
           JULIA_DISTRIBUTED_TESTING_STANDALONE: 1
-          JULIA_NUM_THREADS: 4,4
+          JULIA_NUM_THREADS: '${{ matrix.threads}}'
       - uses: julia-actions/julia-processcoverage@v1
       - uses: codecov/codecov-action@v5
         with: