Cache version key is pulled from env

Author: mcelicalderon

.circleci/config.yml

@@ -9,6 +9,9 @@ jobs:
         type: string
       gemfile:
         type: string
+      cache_version:
+        type: string
+        default: $CACHE_VERSION
     docker:
       - image: 'ruby:<< parameters.ruby-version >>'
     environment:
@@ -20,13 +23,13 @@ jobs:
       - checkout
       - restore_cache:
           keys:
-            - v1.0-<< parameters.gemfile >>-<< parameters.ruby-version >>
+            - v<< parameters.cache_version >>-<< parameters.gemfile >>-<< parameters.ruby-version >>
       - run: gem install bundler -v '1.17'
       - run:
           name: Install dependencies
           command: bundle install
       - save_cache:
-          key: v1.0-<< parameters.gemfile >>-<< parameters.ruby-version >>
+          key: v<< parameters.cache_version >>-<< parameters.gemfile >>-<< parameters.ruby-version >>
           paths:
             - vendor/bundle
       - run: