[CI] Adds GitHub Actions to 6.x

Author: picandocodigo

.github/workflows/6.x.yml

@@ -0,0 +1,27 @@
+name: 6.x
+on:
+  push:
+    branches:
+      - 6.x
+  pull_request:
+    branches:
+      - 6.x
+jobs:
+  test-6x:
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby: [ 2.3, 2.4, 2.5, 2.6, 2.7, jruby ]
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby }}
+    - name: Build and test with Rake
+      run: |
+        sudo apt-get install libcurl4-openssl-dev
+        ruby -v
+        rake bundle:clean
+        rake bundle:install
+        rake test:unit