Re-add support for `iptables` Add package for `useradd`

Overhaul 

Delete sweep.yml 

Add v2.1.0 changes 

Add changelog 

Merge pull request wfg#38 from DavideWalder/helm Add Helm chart

Merge branch 'master' of github.com:wfg/docker-openvpn-client 

Update publishing workflow 

Merge pull request wfg#25 from dngray/pr-expose_config_filename Add VPN_CONFIG_FILE option

Merge pull request wfg#25 from dngray/pr-expose_config_filename Add VPN_CONFIG_FILE option