Switch CI to Github actions

travis-ci.org is dead. While there is travis-ci.com, Voxpupuli is
standardizing on Github Actions.

This adds testing on Ruby 2.6, 2.7 and 3.0.

.github/workflows/release.yml

@@ -0,0 +1,30 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - '*'
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    if: github.repository_owner == 'voxpupuli'
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install Ruby 3.0
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: '3.0'
+      - name: Build gem
+        run: gem build *.gemspec
+      - name: Publish gem to rubygems.org
+        run: gem push *.gem
+        env:
+          GEM_HOST_API_KEY: '${{ secrets.RUBYGEMS_AUTH_TOKEN }}'
+      - name: Setup GitHub packages access
+        run: |
+          mkdir -p ~/.gem
+          echo ":github: Bearer ${{ secrets.GITHUB_TOKEN }}" >> ~/.gem/credentials
+          chmod 0600 ~/.gem/credentials
+      - name: Publish gem to GitHub packages
+        run: gem push --key github --host https://rubygems.pkg.github.com/${{ github.repository_owner }} *.gem

.github/workflows/test.yml

@@ -0,0 +1,46 @@
+name: Test
+
+on:
+  - pull_request
+  - push
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby:
+          - "2.4"
+          - "2.5"
+          - "2.6"
+          - "2.7"
+          - "3.0"
+        puppet:
+          - "7"
+          - "6"
+          - "5"
+        exclude:
+          - puppet: "7"
+            ruby: "2.4"
+          - puppet: "6"
+            ruby: "3.0"
+          - puppet: "5"
+            ruby: "3.0"
+          - puppet: "5"
+            ruby: "2.7"
+    name: Ruby ${{ matrix.ruby }} + Puppet ${{ matrix.puppet }}
+    env:
+      PUPPET_VERSION: "~> ${{ matrix.puppet }}.0"
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+          bundler-cache: true
+      - name: Show Puppet version
+        run: bundle exec puppet --version
+      - name: Run tests
+        run: bundle exec rake
+      - name: Verify gem builds
+        run: gem build *.gemspec