CI: use a separate step to run linters

This makes it easier to separate linter dependencies from older Python
releases.

.github/workflows/ci.yml

@@ -8,21 +8,61 @@ on:
       - main
 
 jobs:
-  ci:
-    strategy:
-      matrix:
-        python: ["3.7", "3.8", "3.9", "3.10", "3.11"]
-    
-    name: "Test on Python ${{ matrix.python }}"
+  lint:
+    name: Linter
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
+      - name: Install Poetry
+        run: pipx install poetry
+      - name: Setup Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.x'
+          cache: poetry
+      - name: Install linting requirements
+        run: poetry install --no-root --with=linting --all-extras
+      - name: Execute linters
+        run: |
+          poetry run black --check --diff .
+          poetry run flake8
+          poetry run mypy
+          poetry run pyright
+
+  test:
+    needs:
+      - lint
+    strategy:
+      matrix:
+        python: ["3.7", "3.8", "3.9", "3.10", "3.11"]
+      fail-fast: false
+    
+    name: "Test on Python ${{ matrix.python }}"
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install Poetry
+        run: pipx install poetry
       - uses: actions/setup-python@v4
         with:
           python-version: "${{ matrix.python }}"
-      - name: Install and configure Poetry
+          cache: poetry
+      - name: Install testing requirements
         run: |
-          pip install -U pip poetry
-          poetry config virtualenvs.create false
-      - name: CI
-        run: make ci
+          poetry install --no-root --with=dev --all-extras
+      - name: Execute tests
+        env:
+          PYTHONDEVMODE: '1'
+        run: poetry run pytest
+
+  test-summary:
+    name: Test matrix status
+    runs-on: ubuntu-latest
+    needs: [test]
+    if: always()
+    steps:
+      - name: Decide whether the needed jobs succeeded or failed
+        uses: re-actors/alls-green@release/v1
+        with:
+          jobs: ${{ toJSON(needs) }}