H-162: serve built frontend from Go image (#34)

Co-authored-by: Rogee <rogee@ipao.vip>

frontend/scripts/check-build.mjs

@@ -0,0 +1,25 @@
+import assert from 'node:assert/strict';
+import { existsSync, readFileSync } from 'node:fs';
+import { fileURLToPath } from 'node:url';
+
+const dist = fileURLToPath(new URL('../dist/', import.meta.url));
+const html = readFileSync(
+  new URL('../dist/index.html', import.meta.url),
+  'utf8'
+);
+const assets = [...html.matchAll(/(?:href|src)="(\/assets\/[^"]+)"/g)].map(
+  match => match[1]
+);
+
+assert.match(html, /<div id="app"><\/div>/);
+assert.match(html, /<script src="\/runtime-config\.js"><\/script>/);
+assert.ok(
+  assets.some(asset => asset.endsWith('.js')),
+  'missing JS asset'
+);
+assert.ok(
+  assets.some(asset => asset.endsWith('.css')),
+  'missing CSS asset'
+);
+assert.ok(!/<script(?![^>]*\bsrc=)[^>]*>/i.test(html), 'inline script found');
+assets.forEach(asset => assert.ok(existsSync(dist + asset.slice(1)), asset));