ci: build for swift 5.9...6.0

.github/workflows/ci.yml

@@ -0,0 +1,32 @@
+name: CI
+
+on:
+  push:
+    branches:
+    - main
+    paths:
+    - '**.yml'
+    - '**.swift'
+  pull_request:
+  workflow_dispatch:
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}-ci
+  cancel-in-progress: true
+
+jobs:
+  linux:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    strategy:
+      matrix:
+        image: ["swift:5.9", "swift:5.10", "swift:6.0"]
+
+    container:
+      image: ${{ matrix.image }}
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+    - name: Build
+      run: |
+        swift build
+