Add .circleci/config.yml

.circleci/config.yml

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+# Use the latest 2.1 version of CircleCI pipeline process engine.
+# See: https://circleci.com/docs/2.0/configuration-reference
+version: 2.1
+
+# Orbs are reusable packages of CircleCI configuration that you may share across projects, enabling you to create encapsulated, parameterized commands, jobs, and executors that can be used across multiple projects.
+# See: https://circleci.com/docs/2.0/orb-intro/
+orbs:
+  ruby: circleci/ruby@1.4.0
+
+# Define a job to be invoked later in a workflow.
+# See: https://circleci.com/docs/2.0/configuration-reference/#jobs
+jobs:
+  build:
+    docker:
+      - image: cimg/ruby:3.1.0
+    executor: ruby/default
+    steps:
+      - checkout
+      - run:
+          name: Which bundler?
+          command: bundle -v
+      - ruby/bundle-install
+
+# Invoke jobs via workflows
+# See: https://circleci.com/docs/2.0/configuration-reference/#workflows
+workflows:
+  sample: # This is the name of the workflow, feel free to change it to better match your workflow.
+    # Inside the workflow, you define the jobs you want to run.
+    jobs:
+      - build