Add soft-failing steps that test with Bazel Rolling Releases (#935)

Co-authored-by: Marcel Hlopko <hlopko@google.com>

Author: philwo

.bazelci/presubmit.yml

@@ -100,6 +100,21 @@ tasks:
     build_targets: *default_linux_targets
     test_targets: *default_linux_targets
     build_flags: *aspects_flags
+  ubuntu2004_rolling:
+    name: "Rolling Bazel Version"
+    bazel: "rolling"
+    platform: ubuntu2004
+    soft_fail: yes
+    build_targets: *default_linux_targets
+    test_targets: *default_linux_targets
+  ubuntu2004_rolling_with_aspects:
+    name: "Rolling Bazel Version With Aspects"
+    bazel: "rolling"
+    platform: ubuntu2004
+    soft_fail: yes
+    build_targets: *default_linux_targets
+    test_targets: *default_linux_targets
+    build_flags: *aspects_flags
   linux_docs:
     name: Docs
     platform: ubuntu2004