ci: build with macos-15-intel

.github/workflows/CI.yml

@@ -6,6 +6,7 @@ on:
     branches:
       - master
     tags: '*'
+  workflow_dispatch:
 
 concurrency:
   # Skip intermediate builds: always.
@@ -15,7 +16,7 @@ concurrency:
 
 jobs:
   test:
-    name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
+    name: Julia ${{ matrix.version }} - ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
     permissions: # needed to allow julia-actions/cache to proactively delete old caches that it has created
       actions: write
@@ -24,24 +25,20 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '1.6'
+          - 'lts'
           - '1'
         os:
           - ubuntu-latest
-          - macOS-13
+          - macOS-latest  # Apple silicon
           - windows-latest
-        arch:
-          - x64
         include:
-          - os: macOS-latest
-            arch: aarch64
-            version: 1
+          - os: macos-15-intel  # Intel
+            version: 'lts'
     steps:
       - uses: actions/checkout@v6
       - uses: julia-actions/setup-julia@v2
         with:
           version: ${{ matrix.version }}
-          arch: ${{ matrix.arch }}
       - uses: julia-actions/cache@v2
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-runtest@v1