Send the UI test results from the CI to DataDog (#28412)

.github/workflows/ci.yml

@@ -194,6 +194,7 @@ jobs:
           secrets: |
             kv/data/github/hashicorp/vault-enterprise/github-token username-and-token | PRIVATE_REPO_GITHUB_TOKEN;
             kv/data/github/hashicorp/vault-enterprise/license license_1 | VAULT_LICENSE;
+            kv/data/github/${{ github.repository }}/datadog-ci DATADOG_API_KEY;
       - if: needs.setup.outputs.is-enterprise == 'true'
         name: Set up Git
         run: git config --global url."https://${{ steps.secrets.outputs.PRIVATE_REPO_GITHUB_TOKEN }}@github.com".insteadOf https://github.com
@@ -217,6 +218,32 @@ jobs:
         with:
           name: test-results-ui
           path: ui/test-results
+      - name: Prepare datadog-ci
+        if: (github.repository == 'hashicorp/vault' || github.repository == 'hashicorp/vault-enterprise') && (success() || failure())
+        continue-on-error: true
+        run: |
+          if type datadog-ci > /dev/null 2>&1; then
+            exit 0
+          fi
+          # Curl does not always exit 1 if things go wrong. To determine if this is successful
+          # we'll silence all non-error output and check the results to determine success.
+          if ! out="$(curl -sSL --fail https://github.com/DataDog/datadog-ci/releases/latest/download/datadog-ci_linux-x64 --output /usr/local/bin/datadog-ci 2>&1)"; then
+            printf "failed to download datadog-ci: %s" "$out"
+          fi
+          if [[ -n "$out" ]]; then
+            printf "failed to download datadog-ci: %s" "$out"
+          fi
+          chmod +x /usr/local/bin/datadog-ci
+      - name: Upload test results to DataDog
+        if: success() || failure()
+        continue-on-error: true
+        env:
+          DD_ENV: ci
+        run: |
+          if [[ ${{ github.repository }} == 'hashicorp/vault' ]]; then
+            export DATADOG_API_KEY=${{ secrets.DATADOG_API_KEY }}
+          fi
+          datadog-ci junit upload --service "$GITHUB_REPOSITORY" 'ui/test-results/qunit/results.xml'
       - if: always()
         uses: test-summary/action@31493c76ec9e7aa675f1585d3ed6f1da69269a86 # v2.4
         with: