build(deploy): migrate from Vercel to Coolify with @astrojs/node + Nixpacks

Swap @astrojs/vercel adapter for @astrojs/node standalone (Vercel adapter
emits serverless functions; Coolify runs a long-lived Node container).
Add web/nixpacks.toml with explicit install/build/start phases.
Fix web/pnpm-workspace.yaml: scaffolded without the packages field, which
broke pnpm install on any environment that validates workspaces strictly
(this was the root cause of the original Coolify build error).

web/astro.config.mjs

@@ -2,7 +2,7 @@
 import { defineConfig } from 'astro/config';
 import tailwindcss from '@tailwindcss/vite';
 import sitemap from '@astrojs/sitemap';
-import vercel from '@astrojs/vercel';
+import node from '@astrojs/node';
 
 // Vite plugin inline: añade Content-Type correcto para .pmtiles y .geojson
 // en dev server. Sin esto, Astro/Vite sirve .pmtiles con Content-Type vacío
@@ -31,7 +31,7 @@ function assetMimePlugin() {
 export default defineConfig({
   site: 'https://casestancades.vercel.app',
   output: 'server',
-  adapter: vercel(),
+  adapter: node({ mode: 'standalone' }),
   integrations: [sitemap()],
   vite: {
     plugins: [assetMimePlugin(), tailwindcss()],

web/nixpacks.toml

@@ -0,0 +1,11 @@
+[phases.setup]
+nixPkgs = ["nodejs_22", "pnpm"]
+
+[phases.install]
+cmds = ["pnpm install --frozen-lockfile"]
+
+[phases.build]
+cmds = ["pnpm run build"]
+
+[start]
+cmd = "node ./dist/server/entry.mjs"

web/package.json

@@ -12,8 +12,8 @@
     "astro": "astro"
   },
   "dependencies": {
+    "@astrojs/node": "11.0.3",
     "@astrojs/sitemap": "^3.7.3",
-    "@astrojs/vercel": "^11.0.3",
     "astro": "^7.0.9",
     "maplibre-gl": "^5.24.0",
     "pmtiles": "^4.4.1"

web/pnpm-workspace.yaml

@@ -1,3 +1,6 @@
+packages:
+  - '.'
+
 allowBuilds:
   esbuild: true
   sharp: true