Run compatibility workflow on push for testing

.github/workflows/compatibility.yaml

@@ -1,26 +1,19 @@
 name: Compatibility
-on:
-  schedule:
-    - cron: '0 4 * * SUN'
+on: push
 jobs:
   test:
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        python: [3.9]
-        toxenv: [py39-test, py39-test-dev]
-        release: [main, latest]
+        python: ['3.11']
+        toxenv: [py311-test, py311-test-dev]
     steps:
     - name: Checkout Repository
       uses: actions/checkout@v2
       with:
         fetch-depth: 0
-    - if: matrix.release != 'main'
-      name: Checkout Release
-      run: |
-        git checkout tags/$(curl -s https://api.github.com/repos/skypyproject/skypy/releases/${{ matrix.release }} | python -c "import sys, json; print(json.load(sys.stdin)['tag_name'])")
     - name: Install Python ${{ matrix.python }}
       uses: actions/setup-python@v2
       with: