Szóval ez lett a vége, így már tényleg jó:
$PSDefaultParameterValues = @{ '*:Encoding' = 'utf8' }
$minionconf = "master:
- egyik
- masik
ssl: True
minion_id_lowercase: True
master_finger: 'fd:ca:00:ed:13:9a:9e:ab:61:04:36:03:ba:63:41:3b:c6:55:0c:76:e1:8b:8a:50:16:b7:0d:26:06:3d:a1:3e'
master_tries: -1
random_startup_delay: 10
ping_interval: 1
"
[System.IO.File]::WriteAllLines("C:\ProgramData\Salt Project\Salt\conf\minion",$minionconf);
[System.IO.File]::WriteAllLines("C:\ProgramData\Salt Project\Salt\conf\minion_id",$([System.Net.Dns]::GetHostByName($env:computerName).HostName.tolower()));
restart-service salt-minion