Skip test if CI (#1632)

* Skip test if CI

We have an existing flakey test that we want to skip on CI, but we need
to pass along the env var to the scheme for it to apply to Xcode builds,
simulators, etc.

* debug

* wip

(cherry picked from commit e93f02ad3247da0010f8a7d012eeec6c5c4b0dae)

# Conflicts:
#	Tests/ComposableArchitectureTests/RuntimeWarningTests.swift

Author: stephencelis

ComposableArchitecture.xcworkspace/xcshareddata/xcschemes/ComposableArchitecture.xcscheme

@@ -61,6 +61,13 @@
       debugDocumentVersioning = "YES"
       debugServiceExtension = "internal"
       allowLocationSimulation = "YES">
+      <EnvironmentVariables>
+         <EnvironmentVariable
+            key = "CI"
+            value = "$(CI)"
+            isEnabled = "YES">
+         </EnvironmentVariable>
+      </EnvironmentVariables>
    </LaunchAction>
    <ProfileAction
       buildConfiguration = "Release"

Tests/ComposableArchitectureTests/RuntimeWarningTests.swift

@@ -118,6 +118,7 @@
       _ = XCTWaiter.wait(for: [.init()], timeout: 0.5)
     }
 
+    #if os(macOS)
     @MainActor
     func testEffectEmitMainThread() async throws {
       try XCTSkipIf(ProcessInfo.processInfo.environment["CI"] != nil)
@@ -190,6 +191,7 @@
       )
       await ViewStore(store).send(.tap).finish()
     }
+    #endif
 
     @MainActor
     func testBindingUnhandledAction() {