Renders the `core/post-excerpt` block on the server.

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

	$excerpt = get_the_excerpt();

	if ( empty( $excerpt ) ) {
		return '';
	}

	$more_text           = ! empty( $attributes['moreText'] ) ? '' . wp_kses_post( $attributes['moreText'] ) . '' : '';
	$filter_excerpt_more = function( $more ) use ( $more_text ) {
		return empty( $more_text ) ? $more : '';
	};
	/**
	 * Some themes might use `excerpt_more` filter to handle the
	 * `more` link displayed after a trimmed excerpt. Since the
	 * block has a `more text` attribute we have to check and
	 * override if needed the return value from this filter.
	 * So if the block's attribute is not empty override the
	 * `excerpt_more` filter and return nothing. This will
	 * result in showing only one `read more` link at a time.
	 */
	add_filter( 'excerpt_more', $filter_excerpt_more );
	$classes = '';
	if ( isset( $attributes['textAlign'] ) ) {
		$classes .= "has-text-align-{$attributes['textAlign']}";
	}
	$wrapper_attributes = get_block_wrapper_attributes( array( 'class' => $classes ) );

	$content               = '
' . $excerpt;
	$show_more_on_new_line = ! isset( $attributes['showMoreOnNewLine'] ) || $attributes['showMoreOnNewLine'];
	if ( $show_more_on_new_line && ! empty( $more_text ) ) {
		$content .= '
' . $more_text . '
';
	} else {
		$content .= " $more_text";
	}
	remove_filter( 'excerpt_more', $filter_excerpt_more );
	return sprintf( '
%2$s
', $wrapper_attributes, $content );
}