Adding missing heron s3 region into kubernetes config (#3697)

Co-authored-by: Windham Wong <windhamwong@nva-hk.com>
diff --git a/heron/config/src/yaml/conf/kubernetes/uploader.yaml b/heron/config/src/yaml/conf/kubernetes/uploader.yaml
index 0509cd6..a86ce6a 100644
--- a/heron/config/src/yaml/conf/kubernetes/uploader.yaml
+++ b/heron/config/src/yaml/conf/kubernetes/uploader.yaml
@@ -21,8 +21,11 @@
 # S3 bucket to put the jar file into
 heron.uploader.s3.bucket: <s3_bucket>
 
+# S3 bucket region
+heron.uploader.s3.region: <s3_region>
+
 # AWS access key
 heron.uploader.s3.access_key: <aws_access_key>
 
 # AWS secret access key
-heron.uploader.s3.secret_key: <aws_secret_key>
\ No newline at end of file
+heron.uploader.s3.secret_key: <aws_secret_key>