Reduce CI memory usage to prevent bazel JVM crashes

Author: gregmagolan

.circleci/bazel.rc

@@ -23,7 +23,7 @@ build --experimental_repository_cache=/home/circleci/bazel_repository_cache
 
 # Workaround https://github.com/bazelbuild/bazel/issues/3645
 # Bazel doesn't calculate the memory ceiling correctly when running under Docker.
-# Limit Bazel to consuming 3072K of RAM
-build --local_resources=3072,2.0,1.0
+# Limit Bazel to consuming 2560K of RAM
+build --local_resources=2560,1.0,1.0
 # Also limit Bazel's own JVM heap to stay within our 4G container limit
-startup --host_jvm_args=-Xmx2G
+startup --host_jvm_args=-Xmx1g