all: add .github/workflows

Author: hajimehoshi

.github/workflows/test.yml

@@ -0,0 +1,27 @@
+name: Test
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        go: ['1.22.x', '1.23.x', '1.24.x']
+    name: Test with Go ${{ matrix.go }} on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    defaults:
+      run:
+        shell: bash
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+
+    - name: Setup Go
+      uses: actions/setup-go@v5
+      with:
+        go-version: ${{ matrix.go }}
+
+    - name: Test
+      run: |
+        go test -v ./...