Create nox-testing.yml

.github/workflows/nox-testing.yml

@@ -0,0 +1,31 @@
+name: tests
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  list_nox_test_sessions:
+    runs-on: ubuntu-latest
+    steps:
+        # (other steps before this: checkout code, install python and nox...)
+
+        - name: list all test sessions
+          id: set-matrix
+          run: echo "::set-output name=matrix::$(nox -s gha_list -- tests)"
+
+    # save the list into the outputs
+    outputs:
+      matrix: ${{ steps.set-matrix.outputs.matrix }}
+
+  run_all_tests:
+    needs: list_nox_test_sessions
+    strategy:
+      fail-fast: false
+      matrix:
+        nox_session: ${{ fromJson(needs.list_nox_test_sessions.outputs.matrix) }}
+    name: Run nox session ${{ matrix.nox_session }}
+    runs-on: ubuntu-latest
+    steps:
+      # (other steps before this: checkout code, install python)
+      - run: nox -s "${{ matrix.nox_session }}"