feat: add github actions metrics upload for build image jobs (#3260)

Signed-off-by: nv-nmailhot <nmailhot@nvidia.com>
Co-authored-by: Anant Sharma <anants@nvidia.com>

Covers queue time and duration metrics

.github/workflows/container-validation-backends.yml

@@ -185,3 +185,33 @@ jobs:
         with:
           image_tag: ${{ steps.build-image.outputs.image_tag }}
           pytest_marks: "e2e and trtllm_marker and gpu_1 and not slow"
+
+  # Upload metrics for this workflow and all its jobs
+  upload-workflow-metrics:
+    name: Upload Workflow Metrics
+    runs-on: gitlab
+    if: always()  # Always run, even if other jobs fail
+    needs: [backend-status-check]  # Wait for the status check which waits for all build jobs
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.x'
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install requests
+      - name: Upload Complete Workflow Metrics
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          WORKFLOW_INDEX: ${{ secrets.WORKFLOW_INDEX }}
+          JOB_INDEX: ${{ secrets.JOB_INDEX }}
+          STEPS_INDEX: ${{ secrets.STEPS_INDEX }}
+        run: |
+          # Run the enhanced metrics upload script
+          python3 .github/workflows/upload_complete_workflow_metrics.py
\ No newline at end of file