Unset SSH environment variables after key file creation for enhanced security

scripts/auto-boot-ollama-host.lua

@@ -107,6 +107,10 @@ local function createSSHKeyFilesFromEnv()
   pub_fh:close()
   os.execute(("chmod 644 %q"):format(SSH_IDENTITY_FILE .. ".pub"))
   log("Wrote SSH public key to " .. SSH_IDENTITY_FILE .. ".pub")
+
+  -- Unset the env vars for security
+  os.setenv("SSH_PRIVATE_KEY", "")
+  os.setenv("SSH_PUBLIC_KEY", "")
 end
 
 local function main()