use setup-python action

Author: lostmsu

.github/workflows/ci-arm.yml

@@ -8,6 +8,9 @@ on: [push, pull_request]
 jobs:
   build:
     runs-on: [self-hosted, linux, ARM64]
+    strategy:
+      matrix:
+        python: ['3.10', '3.9', '3.8']
 
     steps:
     - uses: actions/checkout@v2
@@ -19,24 +22,22 @@ jobs:
           3.1.x
           6.0.x
 
-    - name: Create virtualenv
-      run: |
-        virtualenv -p python3 venv
+    - name: Set up Python ${{ matrix.python }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python }}
 
     - name: Install dependencies
       run: |
-        source venv/bin/activate
         python -m pip install --upgrade pip
         pip install pytest cffi
 
     # Assumes recent Mono
 
     - name: Build
       run: |
-        source venv/bin/activate
         pip install -e .
 
     - name: Test with pytest
       run: |
-        source venv/bin/activate
         pytest