Renders the `core/read-more` block on the server.

function render_block_core_read_more( $attributes, $content, $block ) {
	if ( ! isset( $block->context['postId'] ) ) {
		return '';
	}

	$post_ID            = $block->context['postId'];
	$justify_class_name = empty( $attributes['justifyContent'] ) ? '' : "is-justified-{$attributes['justifyContent']}";
	$wrapper_attributes = get_block_wrapper_attributes( array( 'class' => $justify_class_name ) );
	$more_text          = ! empty( $attributes['content'] ) ? wp_kses_post( $attributes['content'] ) : __( 'Read more' );
	return sprintf(
		'%4s',
		$wrapper_attributes,
		get_the_permalink( $post_ID ),
		esc_attr( $attributes['linkTarget'] ),
		$more_text
	);
}