Add Danger workflow

.github/workflows/danger.yml

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+name: Run Danger
+on:
+  workflow_dispatch:
+  pull_request:
+    types:
+      - opened
+      - reopened
+      - synchronize
+      - ready_for_review
+
+jobs:
+  build:
+    if: github.event.pull_request.draft == false
+    name: Run Danger
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      issues: write
+      pull-requests: write
+    steps:
+      - name: Git checkout
+        uses: actions/checkout@v4
+      - name: Danger
+        uses: 417-72KI/[email protected]
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

Dangerfile.swift

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+import Danger
+
+extension String: Error {}
+
+let danger = Danger()
+
+if danger.github.pullRequest.body == nil {
+    danger.fail("Please add a description to this Pull Request")
+}
+
+SwiftLint
+    .lint(
+        .all(directory: nil),
+        configFile: ".swiftlint.yml"
+    )