test_setup: setup-just does not work on windows 11 arm

Author: mara004

.github/workflows/test_setup.yaml

@@ -25,8 +25,6 @@ jobs:
 
     steps:
 
-      - uses: extractions/setup-just@v3
-      
       # AOTW, the slsa-verifier GH action does not support anything but Ubuntu x86_64.
       - name: slsa-verifier
         if: ${{ startsWith(matrix.os, 'ubuntu') && !endsWith(matrix.os, '-arm') }}
@@ -61,7 +59,7 @@ jobs:
         run: python3 -m pip install -v --no-build-isolation -e .
 
       - name: Build docs
-        run: just docs-build
+        run: python3 -m sphinx -b html docs/source docs/build/html
 
       - name: Run test suite
-        run: just test
+        run: python3 -m pytest tests/