Example config for using Bazel HEAD on CI

.bazelci/presubmit.yml

@@ -1,48 +1,37 @@
 ---
+x_defaults:
+  # YAML has a feature for "repeated nodes", BazelCI is fine with extra nodes
+  # it doesn't know about; so that is used to avoid repeating common subparts.
+  common: &common
+    # We exclude //examples/... because it can only be built / tested with Bazel HEAD.
+    build_targets:
+    - "//..."
+    - "-//examples/..."
+    test_flags:
+    - "--test_timeout=300"
+    test_targets:
+    - "//..."
+    - "-//examples/..."
+
 buildifier:
   version: latest
   warnings: "all"
-platforms:
+
+tasks:
   ubuntu1604:
-    run_targets:
-    build_targets:
-    - "..."
-    test_flags:
-    - "--test_timeout=300"
-    test_targets:
-    - "..."
+    <<: *common
   ubuntu1804:
-    run_targets:
-    build_targets:
-    - "..."
-    test_flags:
-    - "--test_timeout=300"
-    test_targets:
-    - "..."
-  ubuntu1804_nojava:
-    run_targets:
-    build_flags:
-    - "--javabase=@openjdk11_linux_archive//:runtime"
-    build_targets:
-    - "..."
-    test_flags:
-    - "--test_timeout=300"
-    - "--javabase=@openjdk11_linux_archive//:runtime"
-    test_targets:
-    - "..."
+    <<: *common
   macos:
-    run_targets:
-    build_targets:
-    - "..."
-    test_flags:
-    - "--test_timeout=300"
-    test_targets:
-    - "..."
+    <<: *common
   windows:
-    run_targets:
+    <<: *common
+  examples:
+    platform: ubuntu1804
+    bazel: last_green
     build_targets:
-    - "..."
+    - "//examples/..."
     test_flags:
     - "--test_timeout=300"
     test_targets:
-    - "..."
+    - "//examples"