Use env varialbes to replace image urls & tags

Change-Id: I52421a03ddfb88fbad95eef8755c4d8e9c376705
Signed-off-by: ecaiyanlinux <martin.c.yan@est.tech>
Issue-ID: NONRTRIC-560
diff --git a/docker-compose/rapp/docker-compose.yaml b/docker-compose/rapp/docker-compose.yaml
index ade37f7..5477588 100644
--- a/docker-compose/rapp/docker-compose.yaml
+++ b/docker-compose/rapp/docker-compose.yaml
@@ -22,7 +22,7 @@
 
 services:
   r-app:
-    image: nexus3.o-ran-sc.org:10004/o-ran-sc/nonrtric-r-app-catalogue:1.1.0
+    image: "${RAPP_IMAGE_BASE}:${RAPP_IMAGE_TAG}"
     container_name: r-app
     networks:
       default: