Update cloud-robotics.yml

Explicitly enable workspace in HEAD+downstream pipeline

Fixes https://github.com/googlecloudrobotics/core/issues/413
diff --git a/pipelines/cloud-robotics.yml b/pipelines/cloud-robotics.yml
index 159b5fb..fd01116 100644
--- a/pipelines/cloud-robotics.yml
+++ b/pipelines/cloud-robotics.yml
@@ -1,6 +1,7 @@
 ---
 tasks:
   ubuntu1804:
+    skip_in_bazel_downstream_pipeline: True
     shell_commands:
     - |-
       echo '
@@ -10,4 +11,19 @@
       - //...
     test_targets:
       - //...
+  ubuntu1804_latest_bazel:
+    bazel: latest
+    shell_commands:
+    - |-
+      echo '
+      CLOUD_ROBOTICS_CONTAINER_REGISTRY = "gcr.io/dummy"
+      DOCKER_TAG = "latest"' > config.bzl
+    build_targets:
+      - //...
+    test_targets:
+      - //...
+    build_flags:
+      - "--enable_workspace"
+    test_flags:
+      - "--enable_workspace"