Add GitHub actions

Author: jmettraux

Diff for: .github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"

Diff for: .github/workflows/test.yaml

@@ -0,0 +1,36 @@
+
+name: test
+
+on: [ push, pull_request ]
+
+jobs:
+
+  test:
+
+    if: " ! (contains(github.event.head_commit.message, 'skip ci') || contains(github.event.head_commit.message, 'ci skip'))"
+
+    name: ${{matrix.ruby}} on ${{matrix.os}}
+
+    strategy:
+      matrix:
+        os: [ ubuntu-latest ]
+        ruby: [
+          '3.1', '3.2', '3.3', '3.4',
+          'jruby-9.4',
+          'truffleruby-22.3' ]
+        experimental: [ false ]
+      fail-fast: false
+    runs-on: ${{matrix.os}}
+    continue-on-error: ${{matrix.experimental}}
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{matrix.ruby}}
+          bundler-cache: true
+      - run: ruby --version
+      - run: gem --version
+      - run: bundle --version
+      - run: bundle exec proba --no-color
+