Enable configuration of NR UE through a YAML file

This commit adds yaml-cpp library to required docker images and build commands. There is one workaround
in cross-compilation for apt behavior for installing libyaml-cpp-dev. Apt will uninistall previous
versions of the package whenever another one is installed. This means that installing the arm version
breaks amd version and vice versa. This makes it impossible to have both libs installed at the same
time which is required by the cross-compilation build command (it calls cmake twice, once with native
and once with target architecture)

ci-scripts/docker/Dockerfile.unittest.ubuntu22

@@ -30,7 +30,8 @@ FROM ran-base:develop AS ran-tests
 RUN apt-get update && \
     DEBIAN_FRONTEND=noninteractive apt-get upgrade --yes && \
     DEBIAN_FRONTEND=noninteractive apt-get install --yes \
-        libgtest-dev
+        libgtest-dev \
+        libyaml-cpp-dev
 
 RUN rm -Rf /oai-ran
 WORKDIR /oai-ran