chore: add build time to main page

Earthfile

@@ -8,7 +8,7 @@ site:
     RUN bun install --frozen-lockfile
     COPY --dir src index.html style.css vite.config.ts tsconfig.json svelte.config.js /site
     COPY +assets-generated/ /site/assets/generated
-    RUN bun x svelte-kit sync && bun run build
+    RUN export VITE_BUILD_DATE=$(date -Iminutes -u | sed 's/+00:00//') && bun x svelte-kit sync && bun run build
     SAVE ARTIFACT build AS LOCAL build
 
 deploy:

src/routes/(pages)/+page.svelte

@@ -2,6 +2,7 @@
 	import { version } from '../../../package.json';
 	import { i18n } from '$lib/i18n';
 	import type { Snapshot } from '@sveltejs/kit';
+	const buildDate = import.meta.env.VITE_BUILD_DATE || "???";
 
 	let search = '';
 
@@ -219,7 +220,7 @@
 		{/each}
 	</div>
 </nav>
-<footer><a href="https://git.thm.place/thm/test-card">testcard v{version}</a></footer>
+<footer><a href="https://git.thm.place/thm/test-card">testcard v{version} {#if version.startsWith("0")}({buildDate}){/if}</a></footer>
 
 <style>
 	nav {