proper syntax for passing proxy var

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

docker/Dockerfile.base.centos.7.6.1810

@@ -24,6 +24,7 @@
 #
 
 FROM centos:7.6.1810 AS oai-base
+ARG EURECOM_PROXY
 RUN yum update -y && yum install -y \
 vim-common 	\
 git \
@@ -46,7 +47,7 @@ gcc-c++
 ENV USER=root
 
 # In Eurecom env we need a git proxy
-RUN if [[ -v EURECOM_PROXY ]]; then git config --global http.proxy http://proxy.eurecom.fr:8080; fi
+RUN /bin/bash -c "if [[ -v EURECOM_PROXY ]]; then git config --global http.proxy http://proxy.eurecom.fr:8080; fi"
 RUN GIT_SSL_NO_VERIFY=true git clone https://gitlab.eurecom.fr/oai/openairinterface5g.git /openairinterface5g -b develop
 
 WORKDIR /openairinterface5g

docker/Dockerfile.base.ubuntu.16.04

@@ -14,13 +14,14 @@
 # limitations under the License.
 
 FROM ubuntu:16.04 AS oai-base
+ARG EURECOM_PROXY
 RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
     vim-common \
     git \
  && rm -rf /var/lib/apt/lists/*
 
 # In Eurecom env we need a git proxy
-RUN if [[ -v EURECOM_PROXY ]]; then git config --global http.proxy http://proxy.eurecom.fr:8080; fi
+RUN /bin/bash -c "if [[ -v EURECOM_PROXY ]]; then git config --global http.proxy http://proxy.eurecom.fr:8080; fi"
 RUN git clone https://gitlab.eurecom.fr/oai/openairinterface5g/ /openairinterface5g -b develop
 
 

docker/Dockerfile.base.ubuntu.18.04

@@ -14,6 +14,7 @@
 # limitations under the License.
 
 FROM ubuntu:18.04 AS oai-base
+ARG EURECOM_PROXY
 ENV DEBIAN_FRONTEND=noninteractive 
 ENV TZ=Europe
 RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
@@ -23,7 +24,7 @@ RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
  && rm -rf /var/lib/apt/lists/*
 
 # In Eurecom env we need a git proxy
-RUN if [[ -v EURECOM_PROXY ]]; then git config --global http.proxy http://proxy.eurecom.fr:8080; fi
+RUN /bin/bash -c "if [[ -v EURECOM_PROXY ]]; then git config --global http.proxy http://proxy.eurecom.fr:8080; fi"
 RUN git clone https://gitlab.eurecom.fr/oai/openairinterface5g/ /openairinterface5g -b develop