Run CI on GitHub Actions

.github/workflows/action.yml

@@ -0,0 +1,44 @@
+name: Specs
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+  pull_request_target:
+
+jobs:
+  test:
+    runs-on: ubuntu-20.04
+    strategy:
+      matrix:
+        ruby-version:
+          - "2.3"
+          - "2.4"
+          - "2.5"
+          - "2.6"
+          - "2.7"
+          - "3.0"
+        exclude:
+          - ruby-version: "2.3" # Rugged uses the wrong openssl version on CI and segfaults (similar to https://github.com/libgit2/rugged/issues/718)
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby-version }}
+          bundler-cache: true
+      - name: Test & publish code coverage
+        uses: paambaati/codeclimate-action@7bcf9e73c0ee77d178e72c0ec69f1a99c1afc1f3 # v2.7.5
+        env:
+          CC_TEST_REPORTER_ID: 3d676246ffa66d3fdef6253a9870431b1a2da04e9ecb25486c08a38823c37b6a
+          COVERAGE: true
+        with:
+          coverageCommand: bundle exec rspec
+      - if: matrix.ruby-version == '2.4' && github.event_name == 'pull_request'
+        name: Run pronto
+        run: |
+          git fetch -q origin ${{ github.context.pull_request.base.sha }}
+          PRONTO_PULL_REQUEST_ID=${{github.event.number}} \
+          PRONTO_GITHUB_ACCESS_TOKEN="${{ github.token }}" \
+            bundle exec pronto run -f github_status github_pr -c origin/${{ github.event.pull_request.base.ref }}

.rubocop.yml

@@ -1,5 +1,5 @@
 AllCops:
-  TargetRubyVersion: 2.3
+  TargetRubyVersion: 2.4
 
 Documentation:
   Enabled: false

pronto.gemspec

@@ -54,5 +54,6 @@ Gem::Specification.new do |s|
   s.add_development_dependency('rspec-its', '~> 1.2')
   s.add_development_dependency('rspec-expectations', '~> 3.4')
   s.add_development_dependency('rubocop', '~> 0.58')
-  s.add_development_dependency('simplecov', '~> 0.14')
+  s.add_development_dependency('simplecov', '~> 0.17', '!= 0.18.0', '!= 0.18.1', '!= 0.18.2', '!= 0.18.3', '!= 0.18.4',
+                               '!= 0.18.5', '!= 0.19.0', '!= 0.19.1') # see https://docs.codeclimate.com/docs/configuring-test-coverage
 end