Remove Ruby < 3 versions from CircleCI config

.circleci/config.yml

@@ -2,22 +2,6 @@ version: 2.1
 
 # executors are environments in which a job runs. Here we use docker contaners.
 executors:
-  ruby-2-6:
-    docker:
-      - image: circleci/ruby:2.6.6-node-browsers
-      - image: circleci/postgres:10.6
-        environment:
-          - POSTGRES_USER=draft_approve_test
-          - POSTGRES_DB=draft_approve_test
-
-  ruby-2-7:
-    docker:
-      - image: circleci/ruby:2.7.2-node-browsers
-      - image: circleci/postgres:10.6
-        environment:
-          - POSTGRES_USER=draft_approve_test
-          - POSTGRES_DB=draft_approve_test
-
   ruby-3-0:
     docker:
       - image: circleci/ruby:3.0.0-node-browsers
@@ -33,18 +17,12 @@ jobs:
   # We can use YAML to define a part of a job we alias as 'build', and then include it in other jobs to keep things DRY
   build-default: &build
     parameters:
-      run-activerecord-5-2-x:
-        type: boolean
-        default: true
-      run-activerecord-6-0-x:
-        type: boolean
-        default: true
       run-activerecord-6-1-x:
         type: boolean
         default: true
 
     # Specify a default executor for the job
-    executor: ruby-2-6
+    executor: ruby-3-0
     working_directory: ~/repo
 
     steps:
@@ -84,20 +62,6 @@ jobs:
             mkdir /tmp/test-results
             TEST_FILES="$(circleci tests glob "spec/**/*_spec.rb" | circleci tests split --split-by=timings)"
 
-      - when:
-          condition: << parameters.run-activerecord-5-2-x >>
-          steps:
-            - run:
-                name: run activerecord-5.2.x tests
-                command: bundle exec appraisal activerecord-5-2-x rspec
-
-      - when:
-          condition: << parameters.run-activerecord-6-0-x >>
-          steps:
-            - run:
-                name: run activerecord-6.0.x tests
-                command: bundle exec appraisal activerecord-6-0-x rspec
-
       - when:
           condition: << parameters.run-activerecord-6-1-x >>
           steps:
@@ -112,15 +76,6 @@ jobs:
           path: /tmp/test-results
           destination: test-results
 
-  # Specific build jobs for each ruby version
-  build-ruby-2-6:
-    <<: *build
-    executor: ruby-2-6
-
-  build-ruby-2-7:
-    <<: *build
-    executor: ruby-2-7
-
   build-ruby-3-0:
     <<: *build
     executor: ruby-3-0
@@ -129,8 +84,4 @@ jobs:
 workflows:
   build_all_versions:
     jobs:
-      - build-ruby-2-6
-      - build-ruby-2-7
-      - build-ruby-3-0:
-          # Rails/ActiveRecord earlier than 6.x is not compatible with ruby 3
-          run-activerecord-5-2-x: false
+      - build-ruby-3-0