Backport CI migration

.github/workflows/liquid.yml

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+name: Liquid
+on: [push, pull_request]
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        entry:
+          - { ruby: "2.7" } # minimum supported
+          - { ruby: "3.0", rubocop: true } # latest working with rubocop
+          - { ruby: "3.2" } # latest
+    name: test (${{ matrix.entry.ruby }})
+    steps:
+      - uses: actions/checkout@v3
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.entry.ruby }}
+      - uses: actions/cache@v1
+        with:
+          path: vendor/bundle
+          key: ${{ runner.os }}-gems-${{ hashFiles('Gemfile') }}
+          restore-keys: ${{ runner.os }}-gems-
+      - run: bundle install --jobs=3 --retry=3 --path=vendor/bundle
+      - run: bundle exec rake test
+      - name: Run rubocop
+        if: matrix.entry.rubocop
+        run: bundle exec rubocop