.github: Build macOS binary and enable optimisations

.github/workflows/python.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: ['ubuntu-20.04', 'windows-latest']
+        os: ['ubuntu-20.04', 'windows-latest', 'macos-latest']
 
       fail-fast: true
       max-parallel: 3
@@ -21,7 +21,7 @@ jobs:
 
     - uses: actions/setup-python@v2
       with:
-        python-version: '3.8'
+        python-version: '3.10'
 
     - name: Dependencies
       run: pip3 install --upgrade
@@ -43,6 +43,8 @@ jobs:
         --name legendary
         ${{ steps.strip.outputs.option }}
         cli.py
+      env:
+        PYTHONOPTIMIZE: 1
 
     - uses: actions/upload-artifact@v2
       with: