bazel: Explicitly build some targets in presubmit

This will prevent skipping them due to accidental incompatibility
(https://pigweed.dev/bazel_compatibility.html#asserting-compatibility).

Change-Id: Iae8307e0a6f52714e4ef6ae6234340c54e56aa19
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/217191
Reviewed-by: Erik Gilling <konkers@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed-service-accounts.iam.gserviceaccount.com>
Pigweed-Auto-Submit: Ted Pudlik <tpudlik@google.com>
Presubmit-Verified: CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
diff --git a/pigweed.json b/pigweed.json
index 076d642..02478e6 100644
--- a/pigweed.json
+++ b/pigweed.json
@@ -7,7 +7,7 @@
         "default": [
           [
             "build",
-            "//..."
+            "--config=presubmit"
           ]
         ]
       }