add test job

.github/workflows/test.yml

@@ -0,0 +1,31 @@
+name: test
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    name: test
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: checkout
+        uses: actions/checkout@v4
+
+      - name: fetch crystal version
+        id: crystal-version
+        run: echo "crystal=$(cat .crystal-version)"
+
+      - name: install crystal
+        uses: crystal-lang/[email protected]
+        with:
+          crystal: ${{ steps.crystal-version.outputs.crystal }}
+
+      - name: test
+        run: script/test