Add io_uring test environment.

.github/workflows/coverage.yaml

@@ -32,9 +32,6 @@ jobs:
         ruby-version: ${{matrix.ruby}}
         bundler-cache: true
 
-    - name: Backends
-      run: bundle exec ruby -r"io/event" -e "puts IO::Event::Selector.constants"
-
     - name: Run tests
       timeout-minutes: 5
       run: bundle exec bake test

.github/workflows/test-io_uring.yaml

@@ -0,0 +1,47 @@
+name: Test
+
+on: [push, pull_request]
+
+permissions:
+  contents: read
+
+env:
+  CONSOLE_OUTPUT: XTerm
+  IO_EVENT_SELECTOR: URing
+
+jobs:
+  test:
+    name: ${{matrix.ruby}} on ${{matrix.os}} / IO_EVENT_SELECTOR=Select
+    runs-on: ${{matrix.os}}-latest
+
+    strategy:
+      matrix:
+        os:
+          - ubuntu
+
+        ruby:
+          - "3.3"
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: Install packages (Ubuntu)
+      if: matrix.os == 'ubuntu'
+      run: sudo apt-get install -y liburing-dev
+
+    - uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{matrix.ruby}}
+        bundler-cache: true
+        cache-version: io_uring
+
+    - name: Backends
+      run: bundle exec ruby -r"io/event" -e "puts IO::Event::Selector.constants"
+
+    - name: Run tests
+      timeout-minutes: 10
+      run: bundle exec bake test
+
+    - name: Run external tests
+      timeout-minutes: 10
+      run: bundle exec bake test:external