Update kokoro/public/continuous build script path

Change-Id: I34ef99dc411674453761140a6f90a5a4d8ac24df
diff --git a/kokoro/public/continuous.cfg b/kokoro/public/continuous.cfg
index cf31875..d7385ca 100644
--- a/kokoro/public/continuous.cfg
+++ b/kokoro/public/continuous.cfg
@@ -1,7 +1,7 @@
 # Format: //devtools/kokoro/config/proto/build.proto
 
 # Location of the continuous bash script in Git.
-build_file: "git/kokoro/build.sh"
+build_file: "git/core/kokoro/build.sh"
 
 action {
   define_artifacts {