Add proxy environment to allow install packages with yum from conan

README.md

conan-el6-gcc44-x86/Dockerfile

conan-el6-gcc44-x86/docker-compose.yml

conan-el6-gcc44/Dockerfile

conan-el6-gcc44/docker-compose.yml

conan-el6-gcc73-x86/Dockerfile

conan-el6-gcc73-x86/docker-compose.yml

conan-el6-gcc73/Dockerfile

conan-el6-gcc73/docker-compose.yml

conan-el6-gcc83-x86/Dockerfile

conan-el6-gcc83-x86/docker-compose.yml

conan-el6-gcc83/Dockerfile

conan-el6-gcc83/docker-compose.yml

conan-el6-gcc91-x86/Dockerfile

conan-el6-gcc91-x86/docker-compose.yml

conan-el6-gcc91/Dockerfile

conan-el6-gcc91/docker-compose.yml

conan-el7-gcc48-x86/Dockerfile

conan-el7-gcc48-x86/docker-compose.yml

conan-el7-gcc48/Dockerfile