feat(deploy): improve environment variable handling and deployment workflow

- Update .vars to properly export deployment configuration variables
- Modify deploy.sh to conditionally source .vars only in interactive mode
- Remove include directive from makefile to prevent automatic variable loading
- Enhance deployment script reliability by ensuring proper environment setup

deploy.sh

@@ -12,6 +12,10 @@ set -e
 # then remove everything in the data path, untar the tarball and reload the server
 # finally remove the tarball, both from the remote host and locally (cleanup)
 
+if [ -t 0 ]; then # Interactive: prompt user
+  source .vars
+fi
+
 # Check if the username variable is set
 if [ ! -z "${SSH_USERNAME}" ]; then
     SSH_USERNAME="${SSH_USERNAME}@"