Add presubmit for bazel_platforms.

PiperOrigin-RevId: 252795457
Change-Id: Ic76fe0b020cc87710e34e308f44f973f5175b258

.bazelci/presubmit.yml

diff --git a/.bazelci/presubmit.yml b/.bazelci/presubmit.yml
new file mode 100644
index 0000000..d529df1
--- /dev/null
+++ b/.bazelci/presubmit.yml
@@ -0,0 +1,19 @@
+---
+tasks:
+  ubuntu1604:
+    build_targets:
+    - "..."
+  ubuntu1804:
+    build_targets:
+    - "..."
+  ubuntu1804_nojava:
+    build_flags:
+    - "--javabase=@openjdk11_linux_archive//:runtime"
+    build_targets:
+    - "..."
+  macos:
+    build_targets:
+    - "..."
+  windows:
+    build_targets:
+    - "..."