Test: add getContainerId in CLITest.swift

Signed-off-by: ChengHao Yang <17496418+tico88612@users.noreply.github.com>

Author: tico88612

Tests/CLITests/Utilities/CLITest.swift

@@ -312,6 +312,10 @@ class CLITest {
         try inspectContainer(name).status
     }
 
+    func getContainerId(_ name: String) throws -> String {
+        try inspectContainer(name).configuration.id
+    }
+
     func inspectContainer(_ name: String) throws -> inspectOutput {
         let response = try run(arguments: [
             "inspect",