Add CI proxy settings to role skeleton

Change-Id: I66fa956d0651957f6d087a1055b9424531f05902

_skeleton_role_/molecule/default/molecule.yml

@@ -10,6 +10,8 @@ platforms:
     image: centos:7
     dockerfile: Dockerfile
     pkg_extras: python-setuptools
+    volumes:
+      - /etc/ci/mirror_info.sh:/etc/ci/mirror_info.sh:ro
     easy_install:
       - pip
     environment: &env
@@ -21,6 +23,8 @@ platforms:
     image: centos:8
     dockerfile: Dockerfile
     pkg_extras: python*-setuptools
+    volumes:
+      - /etc/ci/mirror_info.sh:/etc/ci/mirror_info.sh:ro
     environment:
       <<: *env