frontend deployment changes & stop prerendering (#7227)

* feat: frontend docker image

* build: tweak gc, disable prerendering

* feat: pass along UA

* fix: fallback to process.env

* build: remove this pr branch test

* fix: don't pin docker image ver

apps/frontend/src/composables/visitor-user-agent.ts

@@ -0,0 +1,9 @@
+import { tryUseNuxtApp } from '#imports'
+
+// Nuxt's `useRequestHeaders` throws outside of a setup context, and `useBaseFetch` is
+// called from plenty of places that no longer have one.
+export function useVisitorUserAgent(): string | undefined {
+	if (!import.meta.server) return undefined
+
+	return tryUseNuxtApp()?.ssrContext?.event?.node?.req?.headers['user-agent']
+}