Split Github workflows into individual files

To get a better overview of all the tasks that are being run as well
as for better maintainability, split the `test` Github workflow into
separate ones, one for executing the Rubocop checks and one per DB
we test against.

Since each DB tests against a grid of Ruby as well as DB versions, this
gives us a better view on which tests are still running.

Also, given that the 18.04 Ubuntu image has been deprecated by Github,
upgrade the Rubocop and Postgres jobs to run on Ubuntu 22 and the MySQL
job to work with Ubuntu 20 (because Ubuntu 22 is incompatible with
MySQL 5.7).

.github/workflows/rspec-on-mysql.yml

@@ -0,0 +1,63 @@
+name: Run RSpec against MySQL
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  # MySQL 5.7 is not supported on Ubuntu 22, therefore using MacOS for this
+  # version
+  test-on-mysql-5-7:
+    runs-on: macos-13
+    strategy:
+      matrix:
+        ruby-version: ['2.7', '3.0', '3.1']
+        mysql-version: ['5.7']
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ankane/setup-mysql@v1
+        with:
+          mysql-version: ${{ matrix.mysql-version }}
+      - name: Create the test database
+        run: mysqladmin create rails_cursor_pagination_testing
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby-version }}
+          bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+      - name: Run tests
+        run: bundle exec rake spec
+        env:
+          DB_ADAPTER: mysql2
+          DB_HOST: 127.0.0.1
+          DB_USER: root
+
+
+  test-on-mysql-8:
+    runs-on: ubuntu-22.04
+    strategy:
+      matrix:
+        ruby-version: ['2.7', '3.0', '3.1', '3.2']
+        mysql-version: ['8.0']
+
+    steps:
+    - uses: actions/checkout@v2
+    - uses: ankane/setup-mysql@v1
+      with:
+        mysql-version: ${{ matrix.mysql-version }}
+    - name: Create the test database
+      run: mysqladmin create rails_cursor_pagination_testing
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby-version }}
+        bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+    - name: Run tests
+      run: bundle exec rake spec
+      env:
+        DB_ADAPTER: mysql2
+        DB_HOST: 127.0.0.1
+        DB_USER: root

.github/workflows/rspec-on-postgres.yml

@@ -0,0 +1,36 @@
+name: Run RSpec against Postgres
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  test-on-postgres:
+    runs-on: ubuntu-22.04
+    strategy:
+      matrix:
+        ruby-version: ['2.7', '3.0', '3.1', '3.2']
+        postgres-version: [12, 13, 14, 15]
+    env:
+      BUNDLE_GEMFILE: Gemfile-postgres
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ankane/setup-postgres@v1
+        with:
+          postgres-version: ${{ matrix.postgres-version }}
+      - name: Create the test database
+        run: createdb rails_cursor_pagination_testing
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby-version }}
+          bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+      - name: Run tests
+        run: bundle exec rake spec
+        env:
+          DB_ADAPTER: postgresql
+          DB_HOST: 127.0.0.1
+          DB_USER: ${{ env.USER }}

.github/workflows/rubocop.yml

@@ -0,0 +1,20 @@
+name: Run Rubocop
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  rubocop:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 2.7
+          bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+      - name: Run Rubocop
+        run: bundle exec rake rubocop

Gemfile

@@ -12,5 +12,3 @@ gem 'rspec'
 gem 'rubocop'
 
 gem 'mysql2'
-
-gem 'pg'

Gemfile-postgres

@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+source 'https://rubygems.org'
+
+# Specify your gem's dependencies in rails_cursor_pagination.gemspec
+gemspec
+
+gem 'rake'
+
+gem 'rspec'
+
+gem 'rubocop'
+
+gem 'pg'

Gemfile-postgres.lock

@@ -0,0 +1,82 @@
+PATH
+  remote: .
+  specs:
+    rails_cursor_pagination (0.3.0)
+      activerecord (>= 6.0)
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    activemodel (7.0.7.2)
+      activesupport (= 7.0.7.2)
+    activerecord (7.0.7.2)
+      activemodel (= 7.0.7.2)
+      activesupport (= 7.0.7.2)
+    activesupport (7.0.7.2)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      tzinfo (~> 2.0)
+    ast (2.4.2)
+    base64 (0.1.1)
+    concurrent-ruby (1.2.2)
+    diff-lcs (1.5.0)
+    i18n (1.14.1)
+      concurrent-ruby (~> 1.0)
+    json (2.6.3)
+    language_server-protocol (3.17.0.3)
+    minitest (5.19.0)
+    parallel (1.23.0)
+    parser (3.2.2.3)
+      ast (~> 2.4.1)
+      racc
+    pg (1.5.3)
+    racc (1.7.1)
+    rainbow (3.1.1)
+    rake (13.0.6)
+    regexp_parser (2.8.1)
+    rexml (3.2.6)
+    rspec (3.12.0)
+      rspec-core (~> 3.12.0)
+      rspec-expectations (~> 3.12.0)
+      rspec-mocks (~> 3.12.0)
+    rspec-core (3.12.2)
+      rspec-support (~> 3.12.0)
+    rspec-expectations (3.12.3)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.12.0)
+    rspec-mocks (3.12.6)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.12.0)
+    rspec-support (3.12.1)
+    rubocop (1.56.1)
+      base64 (~> 0.1.1)
+      json (~> 2.3)
+      language_server-protocol (>= 3.17.0)
+      parallel (~> 1.10)
+      parser (>= 3.2.2.3)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 1.8, < 3.0)
+      rexml (>= 3.2.5, < 4.0)
+      rubocop-ast (>= 1.28.1, < 2.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 2.4.0, < 3.0)
+    rubocop-ast (1.29.0)
+      parser (>= 3.2.1.0)
+    ruby-progressbar (1.13.0)
+    tzinfo (2.0.6)
+      concurrent-ruby (~> 1.0)
+    unicode-display_width (2.4.2)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  pg
+  rails_cursor_pagination!
+  rake
+  rspec
+  rubocop
+
+BUNDLED WITH
+   2.2.33

Gemfile.lock

@@ -32,7 +32,6 @@ GEM
     parser (3.2.2.3)
       ast (~> 2.4.1)
       racc
-    pg (1.5.3)
     racc (1.7.1)
     rainbow (3.1.1)
     rake (13.0.6)
@@ -76,7 +75,6 @@ PLATFORMS
 
 DEPENDENCIES
   mysql2
-  pg
   rails_cursor_pagination!
   rake
   rspec