Adding tzdata and python2 apks

[PaulPrime]

• tzdata is needed for the time zone change in docker to work. I'm using path mount: -v /etc/localtime:/etc/localtime:ro to set the time zone from the host. But without installing tzdata in docker this change is not applied.

• python2 is needed for the Duo Authenticator plugin to work inside the container - https://duo.com/docs/openvpn. I was able to build it once with additional packages: make gcc musl-dev using the documentation from the mentioned website and save it in the /etc/openvpn/duo directory. The problem is though each time I'm rebuilding docker image it's missing python2 package which is required for this plugin to work.

[ycllwl]

#Find the openvpn container ID
docker ps -a

#install tzdata
docker exec -it xxxxxxxx apk add tzdata

#Link to the timezone file. Note that here I have set it to China, so please do not copy it directly.
docker exec -it xxxxxxxx ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime

#authentication settings
docker exec -it xxxxxxxx date