Another try

.github/workflows/test_main.yml

@@ -1,44 +1,60 @@
 name: CI
 
 on:
-  push:
-    branches-ignore:
-      - main
   pull_request:
-    branches-ignore:
-      - main
+  push:
+    branches:
+    - main
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  FORCE_COLOR: "3"
 
 jobs:
-  tests:
-    name: "Python ${{ matrix.python-version }}"
-    runs-on: ${{ matrix.os }}
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+    - uses: actions/checkout@v4
+    - uses: actions/setup-python@v5
+    - uses: pre-commit/action@v3.0.0
 
+  tests:
+    runs-on: ${{ matrix.runs-on }}
+    needs: [lint]
+    timeout-minutes: 60
     strategy:
+      fail-fast: false
       matrix:
-        os: [ubuntu-latest]
-        python-version: ["3.11"]
+        runs-on: [ubuntu-20.04, macos-latest, windows-2019, windows-2022]
 
+    name: Tests on ${{ matrix.runs-on }}
     steps:
-      - uses: "actions/checkout@v2"
-        with:
-          fetch-depth: 0
-
-      # Setup env
-      - uses: "actions/setup-python@v3"
-        with:
-            python-version: "${{ matrix.python-version }}"
-
-      - name: "Installs for ${{ matrix.python-version }}"
-        run: |
-          python --version
-          pip install --upgrade pip wheel setuptools flit
-          pip install --upgrade nox
-
-      - name: "Run nox for ${{ matrix.python-version }}" 
-        run: "nox -s test-${{ matrix.python-version }}"
-
-      - name: Upload coverage reports to Codecov
-        uses: codecov/codecov-action@v4.0.1
-        with:
-          token: ${{ secrets.CODECOV_TOKEN }}
-          slug: rmcar17/SpectralClusterSupertree
+    - uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
+
+    - name: Setup nox
+      uses: wntrblm/nox@2023.04.22
+      with:
+        python-versions: "3.10,3.11"
+
+    # We check all Python's on Linux, because it's fast.
+    # We check minimum Python and maximum Python on all OS's.
+
+    - name: Test on 🐍 3.10
+      if: runner.os == 'Linux'
+      run: nox -s tests-3.10 -- --cov --cov-report=xml --cov-report=term --cov-append --durations=20
+    - name: Test on 🐍 3.11
+      run: nox -s tests-3.11 -- --cov --cov-report=xml --cov-report=term --cov-append --durations=20
+
+    - name: Upload coverage report
+      uses: codecov/codecov-action@v4
+      with:
+        name: ${{ matrix.runs-on }}-any
+        verbose: true
+