Merge branch 'dns-fixes' into 'master'

Set DNS per container rather than the daemon

Closes #307

See merge request !6

src/docker.js

@@ -203,6 +203,8 @@ function createSubcontainer(app, name, cmd, options, callback) {
                 CpuShares: 512, // relative to 1024 for system processes
                 VolumesFrom: isAppContainer ? null : [ app.containerId + ":rw" ],
                 NetworkMode: isAppContainer ? 'cloudron' : ('container:' + app.containerId), // share network namespace with parent
+                Dns: ['172.18.0.1'], // use internal dns
+                DnsSearch: ['.'], // use internal dns
                 SecurityOpt: enableSecurityOpt ? [ "apparmor:docker-cloudron-app" ] : null // profile available only on cloudron
             }
         };