Upgrade Dockerfile base build image

Use bldr-ubuntu18-c-go:4-u18.04-nng

Signed-off-by: Lott, Christopher (cl778h) <cl778h@att.com>
Change-Id: I8de74e479ee6dfb502afd439207f4b943e86d9be

diff --git a/Dockerfile b/Dockerfile
index 1fa513b..7cb06df 100755 (executable)
--- a/Dockerfile
+++ b/Dockerfile
@@ -14,7 +14,7 @@
 #   limitations under the License.
 
 #----------------------------------------------------------
-FROM nexus3.o-ran-sc.org:10004/bldr-ubuntu18-c-go:2-u18.04-nng AS o2mediator-build
+FROM nexus3.o-ran-sc.org:10004/bldr-ubuntu18-c-go:4-u18.04-nng AS o2mediator-build
 
 RUN apt-get update -y && apt-get install -y jq \
       git \