sftp: give it a static ip

src/sftp.js

@@ -10,6 +10,7 @@ const apps = require('./apps.js'),
     assert = require('node:assert'),
     blobs = require('./blobs.js'),
     BoxError = require('./boxerror.js'),
+    constants = require('./constants.js'),
     debug = require('debug')('box:sftp'),
     docker = require('./docker.js'),
     hat = require('./hat.js'),
@@ -105,6 +106,7 @@ async function start(existingInfra) {
                 --hostname sftp \
                 --net cloudron \
                 --net-alias sftp \
+                --ip ${constants.SFTP_SERVICE_IPv4} \
                 --log-driver syslog \
                 --log-opt syslog-address=unix://${paths.SYSLOG_SOCKET_FILE} \
                 --log-opt syslog-format=rfc5424 \