Add tests with GitHub Actions

.github/workflows/ci.yml

@@ -0,0 +1,30 @@
+name: CI
+on:
+  push:
+    branches:
+      - '*'
+    tags:
+      - 'v*'
+  pull_request:
+    branches:
+      - main
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Coursier cache
+      uses: coursier/cache-action@v6
+    - uses: coursier/setup-action@v1
+      with:
+        jvm: adopt:8
+        apps: sbt scala
+    - name: Test
+      run: sbt test
+    - name: Clean up
+      run: |
+        rm -rf "$HOME/.ivy2/local" || true
+        find $HOME/Library/Caches/Coursier/v1        -name "ivydata-*.properties" -delete || true
+        find $HOME/.ivy2/cache                       -name "ivydata-*.properties" -delete || true
+        find $HOME/.cache/coursier/v1                -name "ivydata-*.properties" -delete || true
+        find $HOME/.sbt                              -name "*.lock"               -delete || true