How to deploy to Elastic Beanstalk by using CircleCI 2.1?

config.yml

version: 2.1

orbs:
  aws-cli: circleci/aws-cli@0.1.13

commands:
  zip-app:
    steps:
      - run:
          name: "Zip directory structure"
          command: bash .circleci/zipper.sh
      - persist_to_workspace:
          root: /tmp/builds
          paths:
            - version
            - app.zip
  cached-bundle:
    steps:
      # Restore bundle cache
      - restore_cache:
          keys:
            - rails-bundle-{{ checksum "Gemfile.lock" }}
            - rails-bundle-
      - run:
          name: Bundle Install
          command: bundle check || bundle install
      # Store bundle cache
      - save_cache:
          key: rails-bundle-{{ checksum "Gemfile.lock" }}
          paths:
            - vendor/bundle
  database-setup:
    steps:
      # Database setup
      - run:
          name: "Wait for DB"
          command: dockerize -wait tcp://localhost:5432 -timeout 1m
      - run:
          name: "Database setup"
          command: bin/rails db:schema:load --trace
  rspec-tests:
    steps:
      # Run rspec in parallel
      - run: |
          bundle exec rspec \
          --profile 10 \
          --format RspecJunitFormatter \
          --out test_results/rspec.xml \
          --format progress \
          $(circleci tests glob "spec/**/*_spec.rb" | circleci tests split --split-by=timings)
      # Save test results for timing analysis
      - store_test_results:
          path: test_results
  install-libpython-dev:
    steps:
      - run:
          name: "Install missing library on awscli"
          command: sudo apt-get install -y libpython-dev
  eb-setup:
    steps:
      - run: sudo apt-get update
      - install-libpython-dev
      - aws-cli/install
      - aws-cli/configure:
          aws-access-key-id: AWS_ACCESS_KEY_ID
          aws-secret-access-key: AWS_SECRET_ACCESS_KEY
          aws-region: AWS_DEFAULT_REGION
  eb-update:
    steps:
      - attach_workspace:
          at: /tmp/builds
      - run:
          name: "Deploy zipped app to Elastic Beanstalk"
          command: |
            aws elasticbeanstalk create-application-version \
            --application-name "$EB_APP_NAME" \
            --version-label "`head -n 1 $TMP_BUILDS/version`" \
            --source-bundle "S3Bucket=$AWS_ENV_NAME, S3Key=$EB_APP_NAME/`head -n 1 $TMP_BUILDS/version`.zip"
      - run:
          command: |
            aws elasticbeanstalk update-environment \
            --environment-name $AWS_ENV_NAME \
            --version-label "`head -n 1 $TMP_BUILDS/version`"
  s3-setup:
    steps:
      - run: sudo apt-get update
      - install-libpython-dev
      - aws-cli/install
      - aws-cli/configure:
          aws-access-key-id: AWS_ACCESS_KEY_ID
          aws-secret-access-key: AWS_SECRET_ACCESS_KEY
          configure-default-region: false
  s3-update:
    steps:
      - zip-app
      - run:
          name: "Copy zipped APP to AWS S3"
          command: aws s3 cp "$TMP_BUILDS/app.zip" s3://$AWS_ENV_NAME/$EB_APP_NAME/"`head -n 1 $TMP_BUILDS/version`".zip
  env-name-setup:
    steps:
      - run:
          name: "Evaluate and setup env name to be deployed"
          command: |
            if [ "${CIRCLE_BRANCH}" == "master" ]; then
              echo 'export AWS_ENV_NAME=nisevi-production' >> $BASH_ENV
            elif [ "${CIRCLE_BRANCH}" == "staging" ]; then
              echo 'export AWS_ENV_NAME=nisevi-staging' >> $BASH_ENV
            else
              echo 'export AWS_ENV_NAME=nisevi-development' >> $BASH_ENV
            fi
executors:
  ruby260-pg969:
    docker:
      - image: circleci/ruby:2.6.2
        environment:
          BUNDLE_JOBS: 3
          BUNDLE_RETRY: 3
          BUNDLE_PATH: vendor/bundle
          PGHOST: 127.0.0.1
          PGUSER: nisevi_user
          RAILS_ENV: test
      - image: circleci/postgres:9.6.9-alpine
        environment:
          POSTGRES_USER: nisevi_user
          POSTGRES_DB: nisevi_test
          POSTGRES_PASSWORD: ""

jobs:
  build:
    working_directory: ~/app
    executor: ruby260-pg969
    steps:
      - checkout
      - cached-bundle
      - database-setup
      - rspec-tests
  s3-copy:
    working_directory: ~/app
    executor: ruby260-pg969
    steps:
      - checkout
      - s3-setup
      - env-name-setup
      - s3-update
  eb-deploy:
    working_directory: ~/app
    executor: ruby260-pg969
    steps:
      - checkout
      - eb-setup
      - env-name-setup
      - eb-update
workflows:
  main:
    jobs:
      - build
      - s3-copy:
          requires:
            - build
          filters:
            branches:
              only:
                - development
                - staging
                - master
      - eb-deploy:
          requires:
            - s3-copy
          filters:
            branches:
              only:
                - development
                - staging
                - master

zipper.sh

#!/bin/bash

FILES=('config.ru' \
'Gemfile' \
'Gemfile.lock' \
'Rakefile')

FOLDERS=('.ebextensions' \
'app/assets' \
'app/controllers' \
'app/helpers' \
'app/mailers' \
'app/models' \
'app/services' \
'app/views' \
'bin' \
'config' \
'public' \
'lib')

for i in ${FOLDERS[@]}
do
  FILES=(${FILES[@]} "$i/*");
done

mkdir -p $TMP_BUILDS
touch $TMP_BUILDS/version

echo "`date +%F`-$CIRCLE_SHA1-`date +%s`" > $TMP_BUILDS/version
zip -r $TMP_BUILDS/app.zip ${FILES[@]}

If you want to see it running you can take a look here for the development branch on CircleCI and here to take a look to the project itself.