fix: let the Docker image build see the script its Next config imports

.dockerignore

@@ -10,6 +10,7 @@ lite-image
 !.env.dev.example
 scripts/
 !scripts/lite/
+!scripts/desktop-build-flag.mjs
 !scripts/build-plugin-sandbox.mjs
 !scripts/build-pst-worker.mjs
 !scripts/build-store-worker.mjs

lib/__tests__/dockerignore-scripts.test.ts

@@ -0,0 +1,48 @@
+import { existsSync, readFileSync } from 'fs';
+import { dirname, join, relative, resolve } from 'path';
+import { describe, expect, it } from 'vitest';
+
+const ROOT = resolve(__dirname, '../..');
+
+/** The scripts the image build can see: .dockerignore drops scripts/ and lists them one by one. */
+function allowedScripts(): string[] {
+  return readFileSync(join(ROOT, '.dockerignore'), 'utf-8')
+    .split(/\r?\n/)
+    .filter((line) => line.startsWith('!scripts/'))
+    .map((line) => line.slice(1));
+}
+
+function relativeImports(file: string): string[] {
+  const source = readFileSync(join(ROOT, file), 'utf-8');
+  const found = source.matchAll(/(?:from\s+|import\s*\(\s*|require\(\s*|^import\s+)['"](\.{1,2}\/[^'"]+)['"]/gm);
+  return [...found]
+    .map((match) => relative(ROOT, resolve(ROOT, dirname(file), match[1])).replace(/\\/g, '/'))
+    .filter((target) => existsSync(join(ROOT, target)));
+}
+
+/** Every file under scripts/ reachable from what the Dockerfiles run. */
+function scriptsNeededBy(entries: string[]): Set<string> {
+  const seen = new Set<string>();
+  const queue = [...entries];
+  while (queue.length > 0) {
+    const file = queue.pop()!;
+    if (seen.has(file) || !existsSync(join(ROOT, file))) continue;
+    seen.add(file);
+    if (/\.(mjs|cjs|js|ts)$/.test(file)) queue.push(...relativeImports(file));
+  }
+  return new Set([...seen].filter((file) => file.startsWith('scripts/')));
+}
+
+describe('.dockerignore', () => {
+  it('lets through every script the image build imports', () => {
+    const allowed = allowedScripts();
+    const covered = (file: string) => allowed.some((entry) => (entry.endsWith('/') ? file.startsWith(entry) : file === entry));
+    const entries = ['next.config.ts', ...allowed.filter((entry) => !entry.endsWith('/'))];
+    const missing = [...scriptsNeededBy(entries)].filter((file) => !covered(file));
+    expect(missing).toEqual([]);
+  });
+
+  it('sees the scripts next.config.ts imports', () => {
+    expect(scriptsNeededBy(['next.config.ts'])).toContain('scripts/standalone-guard.mjs');
+  });
+});