feat: add timeline report

.github/workflows/action-self-test.yaml

@@ -413,3 +413,18 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         if: always()
+  timeline-reports-test:
+    needs: action-test
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+      - name: Timeline Report
+        uses: ./
+        with:
+          report-path: './ctrf-reports/timeline/ctrf-report.json'
+          timeline-report: true
+          annotate: false
+        if: always()

CHANGELOG.md

@@ -1,5 +1,6 @@
 ## Unreleased
 
+- Add the `timeline-report` input: a Mermaid Gantt chart of when each test ran on each thread or worker, with per-thread busy and idle time and a table of test timings.
 - Honor proxy and bypass environment variables for GitHub API calls, including authenticated CONNECT proxies and artifact redirects.
 
 - Preserve nested IDs during merge/grouping and renew derived report IDs; retain existing name-based historical test matching.

README.md

@@ -168,6 +168,7 @@ For more advanced usage, there are several inputs available.
     previous-results-report: false
     insights-report: false
     slowest-report: false
+    timeline-report: false
     ai-report: false
     ai-summary-report: false
     skipped-report: false

__tests__/ctrf/report-preparation.test.ts

@@ -512,6 +512,7 @@ function createSingleReportInputs(): Inputs {
 		insightsReport: false,
 		slowestReport: false,
 		fileReport: false,
+		timelineReport: false,
 		communityReport: false,
 		communityReportName: "",
 		artifactName: "",