Simplify matrix condition

Author: ddundo

.github/workflows/test_suite.yml

@@ -26,28 +26,15 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
-  set-matrix:
-    runs-on: ubuntu-latest
-    outputs:
-      matrix: ${{ steps.set-branches.outputs.matrix }}
-    steps:
-      # Set the matrix for the test_suite job. Use master and dev branches for scheduled runs
-      # and the branch of the push event otherwise
-      - id: set-branches
-        run: |
-          if [[ "${{ github.event_name }}" == "schedule" ]]; then
-            echo "matrix={\"branch\":[\"master\",\"dev\"]}" >> $GITHUB_OUTPUT
-          else
-            echo "matrix={\"branch\":[\"${{ github.head_ref }}\"]}" >> $GITHUB_OUTPUT
-          fi
-
   test_suite:
     name: 'Test suite'
-    needs: set-matrix
     runs-on: ubuntu-latest
 
     strategy:
-      matrix: ${{ fromJSON(needs.set-matrix.outputs.matrix) }}
+      matrix:
+        # Run the workflow on master and dev branches if triggered by a schedule event.
+        # Otherwise, run the workflow on the source branch of the pull request.
+        branch: ${{ github.event_name == 'schedule' && fromJSON('["master", "dev"]') || fromJSON('["' + github.head_ref + '"]') }}
       fail-fast: false
 
     # Use pygem:latest for master branch and pygem:dev otherwise