Phase 7: Cosmos deployment

- Dockerfile with a check target (typecheck and tests) and one image per
  service on a pinned Node 22.20 Alpine base, each with only its own
  production dependencies and a health check.
- deploy/compose.yaml: gk-content, gk-admin and gk-site on homelab_network
  with no host ports, read-only root filesystems, no capabilities, the vault's
  Site folder mounted into the content service, and backup.dump=sqlite on it.
- deploy/deploy.sh builds and checks the commit, restarts the stack, and goes
  back to the last good tag if it doesn't come up healthy; rollback.sh swaps
  tags. .gitea/workflows/deploy.yml runs it on a host runner on Cosmos.
- docs/deploy.md runbook (settings, runner, mirror, NPM hosts, Turnstile,
  Healthchecks, backups, cutover) and the stack's inventory note in vault-kit.
- Site: trusts X-Forwarded-Host/Proto for gregkilmer.com hosts so form posts
  pass Astro's origin check behind the proxy; rate limits read
  CF-Connecting-IP; site URL set for absolute links.
- Content service: the held-change webhook carries a Discord-ready message;
  .env.example lists the core settings.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012aSbo2D1qP8cMFQCykf7kx

services/site/astro.config.mjs

@@ -4,11 +4,21 @@ import node from "@astrojs/node";
 import { defineConfig } from "astro/config";
 
 export default defineConfig({
+  site: "https://gregkilmer.com",
   output: "server",
   adapter: node({ mode: "standalone" }),
   trailingSlash: "never",
   build: { format: "file", assets: "assets" },
   devToolbar: { enabled: false },
+  // Behind Nginx Proxy Manager the request arrives over plain http. Trusting
+  // X-Forwarded-Host/Proto for these hosts only lets the form posts pass
+  // Astro's same-origin check without trusting any other host a client sends.
+  security: {
+    allowedDomains: [
+      { hostname: "gregkilmer.com", protocol: "https" },
+      { hostname: "*.gregkilmer.com", protocol: "https" },
+    ],
+  },
   server: { host: true, port: Number(process.env.PORT ?? 4330) },
   vite: {
     // cookie is bundled so the server never picks up express's older copy hoisted to the root.