Add VPS-aware VPN IP allocation

src/main/java/com/litoralregas/vpnprovisioner/vps/SshCommandResult.java

@@ -0,0 +1,8 @@
+package com.litoralregas.vpnprovisioner.vps;
+
+public record SshCommandResult(
+        int exitCode,
+        String stdout,
+        String stderr
+) {
+}