Split coverage reports by collect results, like tests are

That way they will run faster (in parallel) and have not to
wait for tests to end, they will start immediately after
collecting them.

(borrowed from moodle-local_ci where we are using that
technique with success since some time ago)

.github/workflows/ci.yml

@@ -73,8 +73,12 @@ jobs:
   coverage:
     if: github.repository == 'moodlehq/moodle-ci-runner'
     name: Code coverage
-    needs: test
+    needs: collect
     runs-on: ubuntu-22.04
+    strategy:
+      fail-fast: false
+      matrix:
+        test: ${{ fromJson(needs.collect.outputs.matrix) }}
     steps:
       - name: Install required packages
         run: |
@@ -120,18 +124,7 @@ jobs:
             --include-path ${{ github.workspace }}/runner/main \
             --bash-parse-files-in-dir ${{ github.workspace }}/runner/main \
             ${{ github.workspace }}/coverage \
-            bats ${{ github.workspace }}/test/
-
-      - name: Archive code coverage
-        uses: actions/upload-artifact@v4
-        with:
-          name: code-coverage-report
-          path: ${{ github.workspace }}/coverage/*
-
-      - name: Display code coverage
-        run: |
-          value=$(jq -r '.percent_covered' < ${{ github.workspace }}/coverage/bats/coverage.json)
-          echo "Code coverage: $value%" | tee "$GITHUB_STEP_SUMMARY"
+            bats --timing ${{ github.workspace }}/test/${{ matrix.test }}
 
       - name: Upload code coverage (codecov)
         uses: codecov/codecov-action@v4