🚧 Use Danger Swift GitHub Action

.github/workflows/danger.yml

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+name: Danger
+on:
+  pull_request:
+    branches: [ main ]
+jobs:
+  danger:
+    name: Danger
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Danger
+      uses: docker://ghcr.io/danger/danger-swift:3.12.2
+      with:
+        args: --failOnErrors --no-publish-check
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

Dangerfile.swift

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+import Danger
+let danger = Danger()
+
+// Thanks other people!
+if let github = danger.github {
+    let submitter = github.pullRequest.user.login
+    if submitter != "phatblat" && submitter != "chris-araman" {
+        danger.message(":tada: Thanks for your contribution, \(submitter)!")
+    }
+
+    // Mainly to encourage writing up some reasoning about the PR, rather than just leaving a title
+    if github.pullRequest.body?.count ?? 0 < 5 {
+        danger.fail(":memo: Please provide a summary in the Pull Request description.")
+    }
+
+    // Make it more obvious that a PR is a work in progress and shouldn't be merged yet
+    if github.pullRequest.title.contains("[WIP]") {
+        danger.warn(":construction: Title includes `[WIP]`. Please convert the pull request to a Draft.")
+    }
+}