Run tests via GitHub Actions on pull requests (#5)

.github/workflows/ci.yml

@@ -0,0 +1,22 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - main
+    paths-ignore:
+      - 'README.md'
+      - 'LICENSE'
+      - '.spi.yml'
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  test:
+    name: Test
+    runs-on: macOS-14
+    steps:
+      - uses: actions/checkout@v4
+      - name: Test
+        run: set -o pipefail && swift test | xcbeautify --renderer github-actions

README.md

@@ -1,6 +1,6 @@
 # Declarative Text Kit
 
-<!-- [![Build Status][build status badge]][build status] -->
+[![Build Status][build status badge]][build status]
 [![Platforms][platforms badge]][platforms]
 [![Documentation][documentation badge]][documentation]