CI: Lint code on GH actions

Linting runs parallel to testing and circle ci is
slow and our free plan has limited resources.

Also GH actions are better integrated and has better dev
feedback.

Author: tvdeyen

.circleci/config.yml

@@ -232,27 +232,6 @@ commands:
             bundle exec rake -rrails -rspree/testing_support/extension_rake -e'Rake::Task["extension:test_app"].invoke'
 
 jobs:
-  lint_code:
-    docker:
-      - image: cimg/ruby:3.2-node
-        environment:
-          BUNDLE_ONLY: "lint"
-          ESLINT_USE_FLAT_CONFIG: false
-    steps:
-      - checkout
-      - run: "bundle install"
-      - run:
-          name: Check Ruby
-          command: "bin/rake lint:rb"
-      - run:
-          name: Check ERB
-          command: "bin/rake lint:erb"
-      - run:
-          name: Check JavaScript
-          command: "bin/rake lint:js"
-      - store_test_results:
-          path: test-results
-
   solidus_installer:
     executor:
       name: sqlite
@@ -362,7 +341,6 @@ jobs:
 workflows:
   build:
     jobs:
-      - lint_code
       - solidus_installer
       - test_solidus_with_coverage # Only test with coverage support with the default versions
 

.github/workflows/lint.yml

@@ -0,0 +1,62 @@
+name: Lint
+
+on: [pull_request]
+
+concurrency:
+  group: lint-${{ github.ref_name }}
+  cancel-in-progress: ${{ github.ref_name != 'main' }}
+
+permissions:
+  contents: read
+
+env:
+  BUNDLE_ONLY: "lint"
+
+jobs:
+  ruby:
+    name: Check Ruby
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+      - name: Install Ruby and gems
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: "3.2"
+          bundler-cache: true
+      - name: Lint Ruby files
+        run: bin/rake lint:rb
+      - name: Store test results
+        uses: actions/upload-artifact@v4
+        with:
+          name: rubocop-results
+          path: test-results
+
+  erb:
+    name: Check ERB
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+      - name: Install Ruby and gems
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: "3.2"
+          bundler-cache: true
+      - name: Lint ERB files
+        run: bin/rake lint:erb
+
+  javascript:
+    name: Check JavaScript
+    runs-on: ubuntu-22.04
+    env:
+      ESLINT_USE_FLAT_CONFIG: false
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install Ruby and gems
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: "3.2"
+          bundler-cache: true
+      - name: Lint JS files
+        run: bin/rake lint:js