Add a new GA workflow for truffleruby-head

.github/workflows/truffle-ruby-test.yml

@@ -0,0 +1,30 @@
+name: build
+
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron: "30 14 * * *"
+
+jobs:
+  irb:
+    name: rake test truffleruby-head ${{ matrix.with_latest_reline && '(latest reline)' || '' }}
+    strategy:
+      matrix:
+        with_latest_reline: [true, false]
+      fail-fast: false
+    runs-on: ubuntu-latest
+    env:
+      WITH_LATEST_RELINE: ${{matrix.with_latest_reline}}
+    timeout-minutes: 30
+    steps:
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: truffleruby-head
+          bundler-cache: true
+      - name: Run tests
+        run: bundle exec rake test
+      - name: Run tests in isolation
+        run: bundle exec rake test_in_isolation