add video thumbnail generation for opengraph

astro.config.mjs

@@ -7,6 +7,8 @@ import svelte, { vitePreprocess } from '@astrojs/svelte';
 
 import node from '@astrojs/node';
 
+import { tmpdir } from 'node:os';
+
 // https://astro.build/config
 export default defineConfig({
   output: 'server',
@@ -35,6 +37,7 @@ export default defineConfig({
       ADMIN_PASSWORD: envField.string({ context: 'server', access: 'secret', optional: true }),
       ADMIN_COOKIE: envField.string({ context: 'server', access: 'secret', default: 'muelleel' }),
 
+      CACHE_PATH: envField.string({ context: 'server', access: 'secret', default: tmpdir() }),
       UPLOAD_PATH: envField.string({ context: 'server', access: 'secret', optional: true }),
       VIDEO_PATH: envField.string({ context: 'server', access: 'secret', optional: true }),