Updated workflow

.github/workflows/matrix.yaml

@@ -0,0 +1,25 @@
+name: shared matrix
+on:
+  workflow_call:
+    # Map the workflow outputs to job outputs
+    outputs:
+      os:
+        value: ${{ jobs.define-matrix.outputs.os }}
+      python:
+        value: ${{ jobs.define-matrix.outputs.python }}
+
+jobs:
+  define-matrix:
+    runs-on: ubuntu-latest
+    outputs:
+      os:  ${{ steps.os.outputs.os }}
+      python:  ${{ steps.python.outputs.python }}
+    steps:
+      - name: Define OS versions
+        id: os
+        run: |
+          echo 'os=["ubuntu-latest"]' >> "$GITHUB_OUTPUT"
+      - name: Define python versions
+        id: python
+        run: |
+          echo 'python=["3.10"]' >> "$GITHUB_OUTPUT"

.github/workflows/test_integration.yaml

@@ -6,9 +6,18 @@ on:
     types: [ok-to-test-command]
 
 jobs:
+  define-matrix:
+    uses: ./.github/workflows/matrix.yaml
+
   # Branch-based pull request
   integration-trusted:
-    runs-on: ubuntu-latest
+    needs: define-matrix
+    strategy:
+      fail-fast: true
+      matrix:
+        os: ${{ fromJSON(needs.define-matrix.outputs.os) }}
+        python-version: ${{ fromJSON(needs.define-matrix.outputs.python) }}
+    runs-on: ${{ matrix.os }}
     if: github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name == github.repository
     steps:
 
@@ -23,7 +32,13 @@ jobs:
 
   # Repo owner has commented /ok-to-test on a (fork-based) pull request
   integration-fork:
-    runs-on: ubuntu-latest
+    needs: define-matrix
+    strategy:
+      fail-fast: true
+      matrix:
+        os: ${{ fromJSON(needs.define-matrix.outputs.os) }}
+        python-version: ${{ fromJSON(needs.define-matrix.outputs.python) }}
+    runs-on: ${{ matrix.os }}
     permissions:
       pull-requests: write
       checks: write