add rubocop github ci

.github/workflows/rubocop.yml

@@ -0,0 +1,42 @@
+name: RuboCop linting
+
+on:
+  push:
+  pull_request:
+    types: [ opened, reopened ]
+
+jobs:
+  rubocop:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v3
+
+    # If running on a self-hosted runner, check it meets the requirements
+    # listed at https://github.com/ruby/setup-ruby#using-self-hosted-runners
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@55283cc23133118229fd3f97f9336ee23a179fcf # v1.146.0
+      with:
+        ruby-version: 2.7.8
+
+    # This step is not necessary if you add the gem to your Gemfile
+    - name: Install Code Scanning integration
+      run: bundle add code-scanning-rubocop --version 0.3.0 --skip-install
+
+    - name: Install dependencies
+      run: bundle install
+
+    - name: Rubocop run
+      run: |
+        bash -c "
+          bundle exec rubocop --require code_scanning --format sarif -o rubocop.sarif
+          [[ $? -ne 2 ]]
+        "
+
+    - name: Upload Sarif output
+      uses: github/codeql-action/upload-sarif@v2
+      with:
+        sarif_file: rubocop.sarif

.rubocop.yml

@@ -0,0 +1,64 @@
+AllCops:
+  Exclude:
+    - db/migrate/**/*
+    - db/schema.rb
+    - config/**/*
+    - script/**/*
+    - bin/**/*
+    - test/**/*
+    - app/admin/**/*
+    - app/channels/**/*
+    - app/jobs/**/*
+    - node_modules/**/*
+    - Gemfile
+    - Rakefile
+    - config.ru
+
+require:
+  - rubocop-rails
+
+Style/Encoding:
+  Enabled: false
+
+Style/Documentation:
+  Description: 'Document classes and non-namespace modules.'
+  Enabled: false
+
+Style/InlineComment:
+  Description: 'Avoid inline comments.'
+  Enabled: false
+
+Layout/LineLength:
+  Description: 'Limit lines to 100 characters. (Default is 80)'
+  Max: 100
+
+Style/FrozenStringLiteralComment:
+  Description: To help transition from Ruby 2.3.0 to Ruby 3.0.
+  Enabled: false
+
+Style/WordArray:
+  Description: 'Use %w or %W for arrays of words.'
+  Enabled: false
+
+# Defaults all strings to double quotes. Less performant, but
+# nicer for consistency, and for adding interpolation later.
+Style/StringLiterals:
+  EnforcedStyle: double_quotes
+
+# Prettier hashes.
+Layout/HashAlignment:
+  EnforcedHashRocketStyle: table
+  EnforcedColonStyle: table
+
+# No auto-correct for unused block arguments,
+# but will still warn.
+Lint/UnusedBlockArgument:
+  AutoCorrect: false
+
+# No auto-correct for unused method arguments,
+# but will still warn.
+Lint/UnusedMethodArgument:
+  AutoCorrect: false
+
+Rails/HasAndBelongsToMany:
+  Enabled: false

Gemfile

@@ -108,6 +108,7 @@ group :development do
   # static code analysis
   gem 'brakeman', require: false
   gem 'rubocop', require: false
+  gem 'rubocop-rails'
   # gem 'i18n-debug'
   # See https://guides.rubyonrails.org/debugging_rails_applications.html#debugging-with-the-debug-gem
   gem 'debug', platforms: %i[ mri mingw x64_mingw ]

Gemfile.lock

@@ -459,6 +459,11 @@ GEM
       unicode-display_width (>= 2.4.0, < 3.0)
     rubocop-ast (1.30.0)
       parser (>= 3.2.1.0)
+    rubocop-rails (2.23.1)
+      activesupport (>= 4.2.0)
+      rack (>= 1.1)
+      rubocop (>= 1.33.0, < 2.0)
+      rubocop-ast (>= 1.30.0, < 2.0)
     ruby-progressbar (1.13.0)
     ruby2_keywords (0.0.5)
     ruby_dig (0.0.2)
@@ -623,6 +628,7 @@ DEPENDENCIES
   rest-client
   rspec-rails
   rubocop
+  rubocop-rails
   sassc-rails
   selenium-webdriver
   simplecov