Add github action to verify that carthage still builds

.github/workflows/carthage.yml

@@ -0,0 +1,23 @@
+name: Carthage
+
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - "*"
+  pull_request:
+    branches:
+      - "*"
+
+jobs:
+  carthage:
+    name: Carthage Build
+    runs-on: macos-12
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 2.7
+          bundler-cache: true
+      - run: ./test carthage 

Sources/Nimble/Matchers/ThrowAssertion.swift

@@ -137,8 +137,8 @@ public func throwAssertion<Out>() -> Matcher<Out> {
         #else
         let message = """
             The throwAssertion Nimble matcher does not support your platform.
-            Note: throwAssertion no longer works on tvOS or watchOS platforms when you pull in Nimble with Cocoapods.
-            You will have to use Nimble with Swift Package Manager or Carthage.
+            Note: throwAssertion no longer works on tvOS or watchOS platforms when you use Nimble with Cocoapods.
+                  You will have to use Nimble with Swift Package Manager or Carthage.
             """
         fatalError(message)
         #endif

test

@@ -121,7 +121,14 @@ function test_podspec {
     run bundle exec pod --version
     echo "Linting podspec..."
     # Note: remove `--allow-warnings` once old Matcher API has been removed
-    run bundle exec pod lib lint Nimble.podspec --allow-warnings --skip-import-validation --verbose
+    run bundle exec pod lib lint Nimble.podspec
+}
+
+function test_carthage {
+    echo "Gathering Carthage installation information..."
+    run carthage version
+    echo "Verifying that Carthage artifacts build"
+    run carthage build archive --use-xcframeworks
 }
 
 function test_swiftpm {
@@ -184,6 +191,7 @@ function help {
     echo " watchos           - Runs the tests as an watchOS device"
     echo " watchos_xcodespm  - Runs the tests as an watchOS device using the Swift Package Manager version of Xcode"
     echo " podspec           - Runs pod lib lint against the podspec to detect breaking changes"
+    echo " carthage          - Runs verifyies that the carthage artifacts build"
     echo " swiftpm           - Runs the tests built by the Swift Package Manager"
     echo " swiftpm_docker    - Runs the tests built by the Swift Package Manager in a docker linux container"
     echo
@@ -205,6 +213,7 @@ function main {
             macos) test_macos ;;
             macos_xcodespm) test_xcode_spm_macos ;;
             podspec) test_podspec ;;
+            carthage) test_carthage ;;
             test) test ;;
             all) test ;;
             swiftpm) test_swiftpm ;;