Add CI on GitHub

.github/workflows/test.yaml

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+name: Test
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    name: RSpec and Cucumber
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby: [ '2.5', '2.6', '2.7', '3.0', '3.1', jruby ]
+        gemfile: [ gemfiles/rails-6-1.gemfile ]
+        experimental: [ false ]
+        include:
+          - ruby: '3.0'
+            gemfile: gemfiles/rails-6-0.gemfile
+            experimental: false
+          - ruby: '3.0'
+            gemfile: gemfiles/rails-7-0.gemfile
+            experimental: false
+          - ruby: '3.1'
+            gemfile: gemfiles/rails-master.gemfile
+            experimental: false
+          - ruby: ruby-head
+            gemfile: gemfiles/rails-7-0.gemfile
+            experimental: false
+          - ruby: jruby-head
+            gemfile: gemfiles/rails-6-1.gemfile
+            experimental: true
+    runs-on: ubuntu-20.04
+    services:
+      postgres:
+        image: postgres:11
+        ports:
+          - 5432:5432
+        env:
+          POSTGRES_USER: postgres
+          POSTGRES_PASSWORD: postgres
+          POSTGRES_DB: carrierwave_test
+        options: --health-cmd pg_isready --health-interval 10s --health-timeout 5s --health-retries 5
+    env:
+      BUNDLE_GEMFILE: ${{ matrix.gemfile }}
+      EXPERIMENTAL: ${{ matrix.experimental }}
+      JRUBY_OPTS: --debug
+    steps:
+      - uses: actions/checkout@v3
+      - name: Setup ImageMagick policy
+        run: sudo sh -c 'echo '\''<policymap><policy domain="coder" rights="read|write" pattern="PDF" /></policymap>'\'' > /etc/ImageMagick-6/policy.xml'
+      - name: Update package list
+        run: sudo apt update
+      - name: Install ghostscript to process PDF
+        run: sudo apt-get -y install ghostscript
+      - name: Install libvips-dev for Carrierwave::Vips
+        run: sudo apt-get install libvips-dev
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+          bundler-cache: true
+      - name: Run RSpec
+        run: bundle exec rake spec || [ "$EXPERIMENTAL" == "true" ] && true
+      - name: Run Cucumber
+        run: bundle exec rake features || [ "$EXPERIMENTAL" == "true" ] && true

gemfiles/rails-6-0.gemfile

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+source "https://rubygems.org"
+
+gem "rails", "~> 6.0.0"
+gem "activemodel-serializers-xml"
+gem 'sqlite3', platforms: :ruby
+gem "activerecord-jdbcsqlite3-adapter", platform: [:jruby, :truffleruby]
+
+gemspec :path => "../"

gemfiles/rails-6-1.gemfile

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+source "https://rubygems.org"
+
+gem "rails", "~> 6.1.0"
+gem "activemodel-serializers-xml"
+gem 'sqlite3', platforms: :ruby
+gem "activerecord-jdbcsqlite3-adapter", platform: [:jruby, :truffleruby]
+gem "fog-google", "~> 1.13.0" if RUBY_VERSION < '2.7'
+
+gemspec :path => "../"

gemfiles/rails-7-0.gemfile

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+source "https://rubygems.org"
+
+gem "rails", "~> 7.0.0"
+gem "activemodel-serializers-xml"
+gem 'sqlite3', platforms: :ruby
+gem "activerecord-jdbcsqlite3-adapter", platform: [:jruby, :truffleruby]
+
+gemspec :path => "../"