Missing .deb dependency: netbase

[mboes]

When installing Stack in a blank Xenial docker container, we get

FailedConnectionException2 "raw.githubusercontent.com" 443 True getProtocolByName: does not exist (no such protocol name: tcp)

As pointed out here, the reason for this is because the netbase package has not been installed on the system. It should be added to the .deb dependencies for Stack.

[mboes]

By the same token, ca-certificates should be added too. stack setup fails otherwise due to TLS errors.

[borsboom]

Updated the release script so the next release's .debs will include netbase and ca-certificates as dependencies.