feat(docker): adding conf template to gNB container image

ci-scripts/conf_files/enb.band7.tm1.25PRB.usrpb210.conf

ci-scripts/conf_files/enb.band7.tm1.fr1.25PRB.usrpb210.conf

...cripts/conf_files/gnb.band78.tm1.fr1.106PRB.usrpb210.conf

docker/Dockerfile.gNB.rhel8.2

docker/Dockerfile.gNB.ubuntu18

docker/Dockerfile.nrUE.rhel8.2

docker/Dockerfile.phySim.rhel8.2

docker/Dockerfile.ran.rhel8.2

docker/Dockerfile.ran.ubuntu18

docker/scripts/enb_entrypoint.sh

docker/scripts/enb_parameters.yaml

docker/scripts/generateTemplate.py

docker/scripts/gnb_entrypoint.sh

docker/scripts/gnb_parameters.yaml