ci(gitlab): separate Linux and Windows job

The Linux job will have a runner available sooner this way.

Run for pull requests.

.github/workflows/ci.yml

@@ -1,10 +1,26 @@
 name: CI
-
-on: [push]
-
+on: [push, pull_request]
 jobs:
-  test:
-    runs-on: ["ubuntu-latest", "windows-latest"]
+  linux:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.8", "3.9", "3.10", "3.11"]
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install dependencies
+        run: |
+          pip install --upgrade pip
+          pip install poetry tox
+      - name: Test with tox
+        run: |
+          tox run
+  windows:
+    runs-on: windows-latest
     strategy:
       matrix:
         python-version: ["3.8", "3.9", "3.10", "3.11"]