feat: Updated docker file

deploy/.env.example

@@ -7,9 +7,6 @@
 # Must be reachable from managed servers. Use the public host, port 9090.
 GRPC_HOST=192.168.1.250:9090
 
-# Gitea host used to build agent install scripts and download URLs.
-GITEA_HOST=gitea.hostxtra.co.uk
-
 # 64-char hex (32 bytes) for AES-256-GCM. Required for private keys,
 # secrets, OIDC secrets, RDP/VNC credentials.
 # Generate: openssl rand -hex 32