private String createShellCommand(String header, String responseBody) {
        return createShellCommand(header, responseBody, 8080);
    }
Create a HttpWaitStrategy instance with a waitUntilReady implementation

@param ready Indicates that the WaitStrategy has completed waiting successfully.
@return the HttpWaitStrategy instance
core/src/test/java/org/testcontainers/junit/wait/strategy/HttpWaitStrategyTest.java