Memberships: Use nonroot base image

Change-Id: I8ce754b62f283088a979636cf7ed441c5f5fcfac
diff --git a/charts/memberships/templates/install.yaml b/charts/memberships/templates/install.yaml
index 7179d1b..1d0034b 100644
--- a/charts/memberships/templates/install.yaml
+++ b/charts/memberships/templates/install.yaml
@@ -54,7 +54,7 @@
           containerPort: 8081
           protocol: TCP
         command:
-        - memberships
+        - /usr/bin/memberships
         - --port=8080
         - --api-port=8081
         - --db-path=/data/memberships.db