Add SPI docc config (#1094)

Author: finestructure

.spi.yml

@@ -5,9 +5,8 @@ builder:
     scheme: ComposableArchitecture
   - platform: macos-xcodebuild
     scheme: ComposableArchitecture
-  - platform: macos-xcodebuild-arm
-    scheme: ComposableArchitecture
   - platform: tvos
     scheme: ComposableArchitecture
   - platform: watchos
     scheme: ComposableArchitecture_watchOS
+  - documentation_targets: [ComposableArchitecture]

Package.swift

@@ -50,3 +50,11 @@ let package = Package(
     ),
   ]
 )
+
+
+#if swift(>=5.6)
+// Add the documentation compiler plugin if possible
+package.dependencies.append(
+    .package(url: "https://github.com/apple/swift-docc-plugin", from: "1.0.0")
+)
+#endif