Fix Docker build: build to local dist/ then copy to output volume

Astro 6 uses fs.rename() internally during builds, which fails with
EXDEV when source and destination are on different Docker volume mounts.
Instead of using --outDir to write directly to the cross-device /output
mount, build to the default dist/ directory (same filesystem) and copy
the result afterward.

Author: maartenba

astro/package.json

@@ -12,8 +12,7 @@
     "url": "https://github.com/DuendeSoftware/docs.duendesoftware.com.git"
   },
   "notes": {
-    "Astro SVG validation issue": "https://github.com/withastro/astro/issues/13006",
-    "Astro EXDEV rename issue": "fs.rename fails across Docker mount boundaries (cross-device); patched to fall back to copy+unlink"
+    "Astro SVG validation issue": "https://github.com/withastro/astro/issues/13006"
   },
   "scripts": {
     "dev": "astro dev",

astro/patches/astro+6.1.4.patch

@@ -11,25 +11,3 @@ index 0f22881..41cd9ef 100644
    calculate(input) {
      const root = extractorRegExps.root.exec(toUTF8String(input));
      if (root) {
-diff --git a/node_modules/astro/dist/core/build/static-build.js b/node_modules/astro/dist/core/build/static-build.js
-index 79f476a..afb77e9 100644
---- a/node_modules/astro/dist/core/build/static-build.js
-+++ b/node_modules/astro/dist/core/build/static-build.js
-@@ -384,7 +384,7 @@ async function ssrMoveAssets(opts, internals, prerenderOutputDir) {
-         if (!fs.existsSync(currentUrl)) return;
-         const dir = new URL(path.parse(clientUrl.href).dir);
-         if (!fs.existsSync(dir)) await fs.promises.mkdir(dir, { recursive: true });
--        return fs.promises.rename(currentUrl, clientUrl);
-+        try { return await fs.promises.rename(currentUrl, clientUrl); } catch (e) { if (e.code === 'EXDEV') { await fs.promises.copyFile(currentUrl, clientUrl); await fs.promises.unlink(currentUrl); } else { throw e; } }
-       })
-     );
-   }
-@@ -400,7 +400,7 @@ async function ssrMoveAssets(opts, internals, prerenderOutputDir) {
-         if (!fs.existsSync(currentUrl)) return;
-         const dir = new URL(path.parse(clientUrl.href).dir);
-         if (!fs.existsSync(dir)) await fs.promises.mkdir(dir, { recursive: true });
--        return fs.promises.rename(currentUrl, clientUrl);
-+        try { return await fs.promises.rename(currentUrl, clientUrl); } catch (e) { if (e.code === 'EXDEV') { await fs.promises.copyFile(currentUrl, clientUrl); await fs.promises.unlink(currentUrl); } else { throw e; } }
-       })
-     );
-     removeEmptyDirs(fileURLToPath(serverRoot));

build.cs

@@ -54,7 +54,7 @@ await RunAsync("docker",
         "-w /app " +
         "-e NODE_OPTIONS=\"--max-old-space-size=4096\" " +
         "node:22-slim " +
-        "sh -c \"npm ci && npm run build -- --outDir /output\"",
+        "sh -c \"npm ci && npm run build && cp -r dist/. /output/\"",
         configureEnvironment: env => env.Add("MSYS_NO_PATHCONV", "1"));
 });