Embed repository GPG key. (#635)
Embed repository GPG key. (#635)

* Embed repository GPG key.

The keyserver network is increasingly unreliable. Embedding the key
means changing it whenever the trusted key changes, but pulling a new
key from the keyserver also involves changing the key ID to be pulled so
this at least removes a moving part.

* Use sudo for apt-key add.

* Use embedded gpg key for all jobs.

* try using references to avoid gpg key duplication (#669)

ros-infrastructure/ros_buildfarm,ros-infrastructure/ros_buildfarm,ros-infrastructure/ros_buildfarm