setup environment in build.sh, start from building amd64 appimage,
download appimage-builder in docker.

to fix an issue with TLS install newer wget with TLS deps from source
and download buildbot_entrypoint.sh.

…ached

…iformly

- bandit changed how B311 works so we need to annotate accordingly

nonexistent one or for generation of an adress of not supported version.

…to 8

based on the latest upstream code with fixed runtime URL.

The reference link to the UPnP port forwarding tutorial was incorrect. Updated the link to the correct one: http://mattscodecave.com/posts/using-python-and-upnp-to-forward-a-port.html

- fix port check bug
- disable port check just in case

Define magic numbers