Schedule CI for experimental rubies

Author: wildmaples

.github/workflows/experimental.yml

@@ -0,0 +1,33 @@
+name: Experimental Rubies CI Run
+on:
+  schedule:
+    - cron:  '0 0 * * *' # Runs every day at midnight
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    continue-on-error: true
+
+    strategy:
+      matrix:
+        ruby: [head, truffleruby, truffleruby-head]
+
+    env:
+      JAVA_OPTS: '-Xmx1024m'
+      RUBYOPT: '-w'
+      JRUBY_OPTS: '--dev'
+
+    name: "Tests: Experimental Ruby ${{ matrix.ruby }}"
+    steps:
+    - name: Clone Repo
+      uses: actions/checkout@v2
+    - name: Setup system Ruby ${{ matrix.ruby }}
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby }}
+        bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+    - name: Run tests
+      run: |
+        gem install bundler --version 1.17.3
+        echo JAVA_OPTS: $JAVA_OPTS
+        bundle exec rake ci