fix install command for git

do update->upgrade->install instead of update->install

Change-Id: I06e1d3a9cbb77afa11fe377e783892b6d7d9eb23
TBR: Rudominer
diff --git a/kubernetes/report_master/Dockerfile b/kubernetes/report_master/Dockerfile
index 42fdb25..7f0e6fc 100644
--- a/kubernetes/report_master/Dockerfile
+++ b/kubernetes/report_master/Dockerfile
@@ -16,8 +16,9 @@
 
 # If this fails, look for troubleshooting information in the instructions
 # for executing cobaltb.py deploy build.
-RUN apt-get update
-RUN apt-get install -y git
+RUN apt-get update && \
+    apt-get upgrade -y && \
+    apt-get install -y git
 
 COPY analyzer_report_master /usr/local/bin/