feat: Scheduled Execution with Cron and Retry Handling

.env.example

@@ -2,11 +2,11 @@
 
 MASTODON_BASE_URL=https://mastodon.example
 MASTODON_ACCESS_TOKEN=replace-me
-VISIBILITY=public
+MASTODON_VISIBILITY=public
 SITE_URL=https://blog.example.com
 HASHTAGS=#throwback,#10backward
-THROWNBACK_PREFIX=Heute vor 10 Jahren:
-MAX_RETRIES=3
+THROWBACK_PREFIX=Heute vor 10 Jahren:
+MAX_RETRIES=5
 RUN_AT=09:00
 TZ=Europe/Berlin