Remote.html: Install WordPress if it isn't installed yet (#1425)

## What is this PR doing?

Runs the WordPress installation process in remote.html when the loaded
WordPress instance isn't installed yet.

This is to enable the official WordPress release `.zip` to just work in
Playground. Currently it doesn't because remote.html expects a
pre-installed WordPress build with a pre-populated SQLite database
already baked-in. This PR, in conjunction with #1425 and #1426, remove
that requirement.

Related to [Boot
Protocol](#1398)

## Testing Instructions

Confirm the CI checks pass.

packages/playground/remote/src/lib/worker-thread.ts

@@ -12,7 +12,7 @@ import {
 	preloadSqliteIntegration,
 	wordPressRewriteRules,
 } from '@wp-playground/wordpress';
-import { PHPRequestHandler } from '@php-wasm/universal';
+import { PHPRequestHandler, withPHPIniValues } from '@php-wasm/universal';
 import {
 	SyncProgressCallback,
 	bindOpfs,
@@ -21,6 +21,7 @@ import {
 import {
 	defineSiteUrl,
 	defineWpConfigConsts,
+	runWpInstallationWizard,
 	unzip,
 } from '@wp-playground/blueprints';
 
@@ -228,6 +229,34 @@ try {
 		new File([sqliteIntegrationZip], 'sqlite.zip')
 	);
 
+	// Install WordPress if it isn't installed yet
+	const isInstalled =
+		(
+			await primaryPhp.run({
+				code: `<?php 
+		require '${primaryPhp.documentRoot}/wp-load.php';
+		echo is_blog_installed() ? '1' : '0';
+		`,
+			})
+		).text === '1';
+	if (!isInstalled) {
+		// Disable networking for the installation wizard
+		// to avoid loopback requests and also speed it up.
+		// @TODO: Expose withPHPIniValues as a function from the
+		//    php-wasm library.
+		await withPHPIniValues(
+			primaryPhp,
+			{
+				disable_functions: 'fsockopen',
+				allow_url_fopen: '0',
+			},
+			async () =>
+				await runWpInstallationWizard(primaryPhp, {
+					options: {},
+				})
+		);
+	}
+
 	// Always setup the current site URL.
 	await defineSiteUrl(primaryPhp, {
 		siteUrl: scopedSiteUrl,

packages/playground/wordpress-builds/src/sqlite-database-integration/get-sqlite-database-plugin-details.ts

@@ -1,4 +1,3 @@
-
 // @ts-ignore
 import url from './sqlite-database-integration.zip?url';
 
@@ -10,4 +9,3 @@ import url from './sqlite-database-integration.zip?url';
  */
 export const size = 83956;
 export { url };
-