Add test reporter

.github/workflows/test-report.yml

@@ -0,0 +1,32 @@
+# Yoinked from https://github.com/ppy/osu/blob/e12249f1270a22cf5811a8bb7a9ee44f2c0250db/.github/workflows/report-nunit.yml
+# This is a workaround to allow PRs to report their coverage. This will run inside the base repository.
+# See:
+#   * https://github.com/dorny/test-reporter#recommended-setup-for-public-repositories
+#   * https://docs.github.com/en/actions/reference/authentication-in-a-workflow#permissions-for-the-github_token
+name: Annotate CI run with test results
+on:
+  workflow_run:
+    workflows: [ "Continuous Integration" ]
+    types:
+      - completed
+jobs:
+  annotate:
+    name: Annotate CI run with test results
+    runs-on: ubuntu-latest
+    if: ${{ github.event.workflow_run.conclusion != 'cancelled' }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - { prettyname: Windows }
+          - { prettyname: macOS }
+          - { prettyname: Linux }
+    timeout-minutes: 5
+    steps:
+      - name: Annotate CI run with test results
+        uses: dorny/test-reporter@v1.4.2
+        with:
+          artifact: lighthouse-test-results-${{matrix.os.prettyName}}
+          name: Test Results (${{matrix.os.prettyname}})
+          path: "*.trx"
+          reporter: dotnet-trx