Remove macos-latest from ets-from-source workflow

Author: mdickinson

.github/workflows/ets-from-source.yml

@@ -16,15 +16,11 @@ jobs:
   test-with-edm:
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        os: [ubuntu-latest, windows-latest]
         toolkit: ['pyside6']
+        runtime: ['3.8']
+    timeout-minutes: 20
     runs-on: ${{ matrix.os }}
-    env:
-      # Set root directory, mainly for Windows, so that the EDM Python
-      # environment lives in the same drive as the cloned source. Otherwise
-      # 'pip install' raises an error while trying to compute
-      # relative path between the site-packages and the source directory.
-      EDM_ROOT_DIRECTORY: ${{ github.workspace }}/.edm
     steps:
       - uses: actions/checkout@v4
       - name: Install Qt dependencies
@@ -42,7 +38,7 @@ jobs:
       - name: Install click to the default EDM environment
         run: edm install -y wheel click coverage
       - name: Install test environment
-        run: edm run -- python etstool.py install --toolkit=${{ matrix.toolkit }} --source
+        run: edm run -- python etstool.py install --toolkit=${{ matrix.toolkit }} --runtime=${{ matrix.runtime }} --source
       - name: Run tests (Linux)
         if: matrix.os == 'ubuntu-latest'
         run: xvfb-run -a edm run -- python etstool.py test --toolkit=${{ matrix.toolkit }}