Use nox to generate test matrix

Author: mmwinther

.github/workflows/tests.yml

@@ -15,21 +15,24 @@ on:
       - ".github/workflows/tests.yml"
 
 jobs:
+  generate-jobs:
+    runs-on: ubuntu-latest
+    outputs:
+      session: ${{ steps.set-matrix.outputs.session }}
+    steps:
+      - uses: actions/checkout@v6
+      - name: Install uv
+        uses: astral-sh/setup-uv@v7
+      - id: set-matrix
+        run: echo session=$(uvx nox@2025.11.12 --json -l | jq -c '[.[].session]') | tee --append $GITHUB_OUTPUT
   tests:
-    name: ${{ matrix.session }} ${{ matrix.python }} / ${{ matrix.os }}
-    runs-on: ${{ matrix.os }}
+    name: ${{ matrix.session }}
+    needs: [generate-jobs]
+    runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
-        include:
-          - { python: "3.13", os: "ubuntu-latest", session: "pre-commit" }
-          - { python: "3.12", os: "ubuntu-latest", session: "mypy" }
-          - { python: "3.13", os: "ubuntu-latest", session: "mypy" }
-          - { python: "3.12", os: "ubuntu-latest", session: "tests" }
-          - { python: "3.13", os: "ubuntu-latest", session: "tests" }
-          - { python: "3.13", os: "ubuntu-latest", session: "typeguard" }
-          - { python: "3.13", os: "ubuntu-latest", session: "xdoctest" }
-          - { python: "3.13", os: "ubuntu-latest", session: "docs-build" }
+        session: ${{ fromJson(needs.generate-jobs.outputs.session) }}
 
     env:
       NOXSESSION: ${{ matrix.session }}
@@ -39,12 +42,6 @@ jobs:
     steps:
       - name: Check out the repository
         uses: actions/checkout@v6
-
-      - name: Set up Python ${{ matrix.python }}
-        uses: actions/setup-python@v6.1.0
-        with:
-          python-version: ${{ matrix.python }}
-
       - name: Install uv
         uses: astral-sh/setup-uv@v7
         with: