fix: make linkstack timezone configurable via env instead of hardcoded

Author: madhuragrawal

blueprints/linkstack/docker-compose.yml

@@ -4,7 +4,7 @@ services:
   linkstack:
     image: linkstackorg/linkstack:latest
     environment:
-      TZ: "Europe/Berlin"
+      TZ: "${TZ:-UTC}"
       SERVER_ADMIN: "${admin_email}"
       HTTP_SERVER_NAME: "${main_domain}"
       HTTPS_SERVER_NAME: "${main_domain}"

blueprints/linkstack/template.toml

@@ -10,7 +10,7 @@ port = 80
 host = "${main_domain}"
 
 [config.env]
-TZ = "Europe/Berlin"
+TZ = "UTC"
 SERVER_ADMIN = "${admin_email}"
 HTTP_SERVER_NAME = "${main_domain}"
 HTTPS_SERVER_NAME = "${main_domain}"