.circleci/config.yml in friendly_shipping-0.6.5 vs .circleci/config.yml in friendly_shipping-0.7.0

@@ -1,15 +1,18 @@
 # Ruby CircleCI 2.0 configuration file
 #
 # Check https://circleci.com/docs/2.0/language-ruby/ for more details
 #
-version: 2
+version: 2.1
 jobs:
-  build:
+  test:
+    parameters:
+      ruby-version:
+        type: string
     docker:
       # specify the version you desire here
-       - image: circleci/ruby:2.5
+       - image: cimg/ruby:<< parameters.ruby-version >>
 
       # Specify service dependencies here if necessary
       # CircleCI maintains a library of pre-built images
       # documented at https://circleci.com/docs/2.0/circleci-images/
       # - image: circleci/postgres:9.4
@@ -20,11 +23,11 @@
       - checkout
 
       # Download and cache dependencies
       - restore_cache:
           keys:
-          - v1-dependencies-{{ checksum "friendly_shipping.gemspec" }}
+          - v1-dependencies-{{ checksum "friendly_shipping.gemspec" }}-<< parameters.ruby-version >>
           # fallback to using the latest cache if no exact match is found
           - v1-dependencies-
 
       - run:
           name: install dependencies
@@ -33,11 +36,11 @@
             bundle install --jobs=4 --retry=3 --path vendor/bundle
 
       - save_cache:
           paths:
             - ./vendor/bundle
-          key: v1-dependencies-{{ checksum "Gemfile.lock" }}
+          key: v1-dependencies-{{ checksum "Gemfile.lock" }}-<< parameters.ruby-version >>
 
       - run:
           name: run Rubocop
           command: bundle exec rubocop
 
@@ -58,5 +61,15 @@
       - store_test_results:
           path: /tmp/test-results
       - store_artifacts:
           path: /tmp/test-results
           destination: test-results
+
+workflows:
+  build_and_test:
+    jobs:
+      - test:
+          matrix:
+            parameters:
+              # https://github.com/CircleCI-Public/cimg-ruby
+              # only supports the last three ruby versions
+              ruby-version: ["3.1", "3.0", "2.7"]