Add fixed port range for sub-processor debugger

.github/workflows/ci.yml

@@ -0,0 +1,73 @@
+name: CI
+on:
+  push:
+    branches: [ master, release* ]
+    tags: [v*]
+  pull_request:
+    branches: [ master, release* ]
+
+defaults:
+  run: 
+    shell: bash
+
+jobs:
+  build:
+    name: Build job
+    runs-on: ubuntu-20.04
+
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - ruby-version: 1.9.3-p551
+            bundler-version: 1.17.3
+            run-linter: false
+
+          - ruby-version: 2.0.0-p648
+            bundler-version: 1.17.3
+            run-linter: false
+
+          - ruby-version: 2.1.10
+            bundler-version: 1.17.3
+            run-linter: false
+
+          - ruby-version: 2.2.10
+            bundler-version: 1.17.3
+            run-linter: false
+
+          - ruby-version: 2.3.8
+            bundler-version: 2.2.32
+            run-linter: false
+
+          - ruby-version: 2.4.10
+            bundler-version: 2.2.32
+            run-linter: false
+
+          - ruby-version: 2.5.8
+            bundler-version: 2.2.32
+            run-linter: true
+
+          - ruby-version: 2.6.6
+            bundler-version: 2.2.32
+            run-linter: true
+
+          - ruby-version: 3.0.0
+            bundler-version: 2.2.32
+            run-linter: true
+
+    container: ruby:${{ matrix.ruby-version }}
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Install Bundler and gems
+        run: |
+             gem install bundler -v ${{ matrix.bundler-version }}
+             bundle install
+
+      - name: Linting
+        if: ${{ matrix.run-linter }}
+        run: bundle exec standardrb
+
+      - name: Unit Tests
+        run: bundle exec rake

.standard.yml

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+# Oldest version of Ruby supported by the Debugger.
+ruby_version: 1.9.3
+
+# Ignore some rules that are only valid in
+# newer versions of Ruby.
+ignore:
+  - '**/*':
+    - Style/SafeNavigation # The & nil check is not available until Ruby 2.3.