ci: download serverless build for serverless system-tests

Author: florentinl

.github/workflows/system-tests.yml

@@ -391,9 +391,41 @@ jobs:
           name: logs_parametric
           path: artifact.tar.gz
 
+  download-serverless-s3-wheels:
+    needs: [should-run]
+    if: needs.should-run.outputs.run == 'true' && (github.event_name != 'schedule' || github.event.repository.fork == false)
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
+
+      - name: Resolve commit SHA
+        id: resolve-sha
+        run: |
+          if [ "${{ github.event_name }}" = "pull_request" ]; then
+            echo "sha=${{ github.event.pull_request.head.sha }}" >> "$GITHUB_OUTPUT"
+          else
+            echo "sha=${{ github.sha }}" >> "$GITHUB_OUTPUT"
+          fi
+
+      - name: Download wheels from S3
+        run: |
+          bash scripts/download-s3-wheels.sh \
+            "${{ steps.resolve-sha.outputs.sha }}" \
+            ./wheels \
+            serverless
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7.0.0
+        with:
+          name: wheels-manylinux_x86_64_serverless
+          path: ./wheels/*.whl
+
   serverless-system-tests-build-layer:
     runs-on: ubuntu-latest
-    needs: [download-s3-wheels]
+    needs: [download-serverless-s3-wheels]
     steps:
       - name: Checkout datadog-lambda-python
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
@@ -404,7 +436,7 @@ jobs:
       - name: Download wheel to binaries directory
         uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
         with:
-          name: wheels-manylinux_x86_64
+          name: wheels-manylinux_x86_64_serverless
           path: artifacts/
 
       - name: Build datadog_lambda layer