https://download.rethinkdb.com/apt/pubkey.gpg missing

[ghost]

I'm trying to use the Elixir driver and found Travis couldn't find the OpenGPG key file under https://download.rethinkdb.com/apt/pubkey.gpg.

Failed to stop rethinkdb.service: Unit rethinkdb.service not loaded.
$ wget -qO- https://download.rethinkdb.com/apt/pubkey.gpg | sudo apt-key add -v -''
gpg: no valid OpenPGP data found.
E: No packages found
0.37s$ sudo apt-get install -y -o Dpkg::Options::='--force-confnew' rethinkdb=$package_version
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package rethinkdb
Installing RethinkDB default instance configuration
cp: cannot stat '/etc/rethinkdb/default.conf.sample': No such file or directory
Starting RethinkDB v2.4
0.11s$ sudo service rethinkdb start
Failed to start rethinkdb.service: Unit rethinkdb.service not found.
$ rethinkdb --version
rethinkdb: command not found

RethinkDB is available as on addon, so I believe the OpenGPG key URL is managed by Travis or someone else I don't know yet.

The OpenGPG file available at https://download.rethinkdb.com/repository/raw/pubkey.gpg as I found after browsing Nexus https://download.rethinkdb.com/#browse/browse:raw:pubkey.gpg

Locally I can run the tests, and none fails, but Travis fails due to the inability to install RethinkDB. Who can help me with the TravisCI RethinkDB addon?

Edit:
https://travis-ci.community/t/rethinkdb-addon-does-not-start/3612/7