chore(ci): post-review changes

* Dockerfile argument is now a generic BUILD_OPTION for any build_oai available option
  * docker-compose files are only modified at deployment time. Not needed for undeployment
  * fixes for oai-nr-cuup
  * cleaner section for the private registry push

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

docker/Dockerfile.eNB.ubuntu20

@@ -32,7 +32,7 @@ FROM ran-build:latest AS enb-build
 
 #start from scratch for target executable
 FROM ubuntu:focal as oai-enb
-ARG SANITIZE_OPTION
+ARG BUILD_OPTION
 ENV DEBIAN_FRONTEND=noninteractive
 ENV TZ=Europe/Paris
 
@@ -59,7 +59,7 @@ RUN apt-get update && \
         python3-requests \
         libusb-1.0-0 && \
 # if the --sanitize option was used to build, additional packages are required
-    /bin/bash -c 'if [[ "$SANITIZE_OPTION" = "--sanitize" ]]; then DEBIAN_FRONTEND=noninteractive apt-get install --yes \
+    /bin/bash -c 'if [[ "$BUILD_OPTION" = "--sanitize" ]]; then DEBIAN_FRONTEND=noninteractive apt-get install --yes \
         libasan5 \
         libubsan1 \
         liblapacke; fi' && \