Add GH actions

.github/workflows/lint.yml

@@ -0,0 +1,16 @@
+name: Lint
+on:
+  - pull_request
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Install
+        uses: trinhngocthuyen/gh-actions/rb/install@main
+        with:
+          bundle-install: true
+      - name: Makefile
+        uses: trinhngocthuyen/gh-actions/core/makefile@main
+        with:
+          targets: lint

.github/workflows/test.yml

@@ -0,0 +1,19 @@
+name: Test
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Install
+        uses: trinhngocthuyen/gh-actions/rb/install@main
+        with:
+          bundle-install: true
+      - name: Makefile
+        uses: trinhngocthuyen/gh-actions/core/makefile@main
+        with:
+          targets: test

.rubocop.yml

@@ -1,6 +1,9 @@
 AllCops:
   NewCops: enable
   SuggestExtensions: false
+  Include:
+    - lib/**/*.rb
+    - spec/**/*.rb
   Exclude:
     - spec/spec_helper.rb