Add github workflows

Author: danielctull

.github/workflows/ci.yml

@@ -0,0 +1,41 @@
+name: CI
+
+on:
+  - push
+  - pull_request
+
+jobs:
+
+  linux:
+    name: Linux (Swift ${{ matrix.swift-version }})
+    strategy:
+      fail-fast: false
+      matrix:
+        swift-version:
+          - "6.0"
+          - "6.1"
+    runs-on: ubuntu-latest
+    container:
+      image: swift:${{ matrix.swift-version }}
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+    - name: Swift Version
+      run: swift --version
+    - name: Build
+      run: swift build -v
+    - name: Test
+      run: swift test -v
+
+  macos:
+    name: macOS
+    runs-on: macos-15
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+    - name: Swift Version
+      run: swift --version
+    - name: Build
+      run: swift build -v
+    - name: Test
+      run: swift test -v

.github/workflows/nightly.yml

@@ -0,0 +1,22 @@
+name: Nightly
+
+on:
+  schedule:
+    - cron: '0 0 * * * '
+
+jobs:
+
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    container:
+      image: swiftlang/swift:nightly
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+    - name: Swift Version
+      run: swift --version
+    - name: Build
+      run: swift build -v
+    - name: Test
+      run: swift test -v

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version: 6.1
+// swift-tools-version: 6.0
 
 import PackageDescription