Add code-scanning-rubocop to Gemfile

.github/workflows/rubocop.yml

@@ -32,12 +32,8 @@ jobs:
       with:
         ruby-version: 2.7
 
-    # This step is not necessary if you add the gem to your Gemfile
-    - name: Install Code Scanning integration
-      run: bundle add code-scanning-rubocop --skip-install
-
     - name: Install dependencies
-      run: bundle install
+      run: bundle install --with=ci
 
     - name: Rubocop run
       run: |

Gemfile

@@ -3,3 +3,7 @@
 source 'http://rubygems.org'
 
 gemspec
+
+group :ci do
+    gem 'code-scanning-rubocop'
+end

Gemfile.lock

@@ -8,6 +8,8 @@ GEM
   remote: http://rubygems.org/
   specs:
     ast (2.4.2)
+    code-scanning-rubocop (0.6.1)
+      rubocop (~> 1.0)
     colorize (0.8.1)
     parallel (1.22.1)
     parser (3.1.2.0)
@@ -36,6 +38,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
+  code-scanning-rubocop
   format-staged!
   rake (~> 13.0)
   rubocop (~> 1.29)