ci: Add GitHub Actions workflows for automated testing and linting

.github/actionlint-matcher.json

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+{
+  "problemMatcher": [
+    {
+      "owner": "actionlint",
+      "pattern": [
+        {
+          "regexp": "^(?:\\x1b\\[\\d+m)?(.+?)(?:\\x1b\\[\\d+m)?:(?:\\x1b\\[\\d+m)?(\\d+)(?:\\x1b\\[\\d+m)?:(?:\\x1b\\[\\d+m)?(\\d+)(?:\\x1b\\[\\d+m)?: (?:\\x1b\\[\\d+m)?(.+?)(?:\\x1b\\[\\d+m)? \\[(.+?)\\]$",
+          "file": 1,
+          "line": 2,
+          "column": 3,
+          "message": 4,
+          "code": 5
+        }
+      ]
+    }
+  ]
+}

.github/workflows/lint-swift.yml

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+name: Lint Swift
+
+on:
+  pull_request:
+    branches:
+      - '*'
+    paths:
+      - '**/*.swift'
+      - 'Package.swift'
+      - 'Package.resolved'
+      - '.swiftlint.yml'
+      - '.github/workflows/lint-swift.yml'
+
+jobs:
+  swiftlint:
+    name: SwiftLint
+    runs-on: macos-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Install SwiftLint
+      run: brew install swiftlint
+
+    - name: Run SwiftLint
+      run: swiftlint lint --strict

.github/workflows/lint-workflows.yml

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+name: Lint Workflows
+
+on:
+  pull_request:
+    branches:
+      - '*'
+    paths:
+      - '.github/workflows/*.yml'
+      - '.github/actionlint-matcher.json'
+
+jobs:
+  actionlint:
+    name: actionlint
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Download actionlint
+      id: get_actionlint
+      run: bash <(curl https://raw.githubusercontent.com/rhysd/actionlint/main/scripts/download-actionlint.bash)
+      shell: bash
+
+    - name: Register problem matcher
+      run: echo "::add-matcher::.github/actionlint-matcher.json"
+
+    - name: Run actionlint
+      run: ${{ steps.get_actionlint.outputs.executable }} -color
+      shell: bash

.github/workflows/test.yml

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+name: Test
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - '**/*.swift'
+      - 'Package.swift'
+      - 'Package.resolved'
+      - '.github/workflows/test.yml'
+  pull_request:
+    branches:
+      - '*'
+    paths:
+      - '**/*.swift'
+      - 'Package.swift'
+      - 'Package.resolved'
+      - '.github/workflows/test.yml'
+
+jobs:
+  macos:
+    name: macOS
+    runs-on: macos-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Swift version
+      run: swift --version
+
+    - name: Build
+      run: swift build -v
+
+    - name: Run tests
+      run: swift test -v