Use Github actions to run CI

Author: grzegorz-jakubiak

.github/workflows/codecheck.yml

@@ -0,0 +1,12 @@
+name: Codecheck
+on: [push, pull_request]
+jobs:
+  codecheck:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: 2.7 
+        bundler-cache: true
+    - run: bundle exec rubocop

.github/workflows/tests.yml

@@ -0,0 +1,17 @@
+name: Tests
+on: [push, pull_request]
+jobs:
+  test:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest]
+        ruby: [2.5, 2.6, 2.7]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v2
+    - uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby }}
+        bundler-cache: true
+    - run: bundle exec rake