`curl --location https://packagecloud.io/cloudamqp/lavinmq/gpgkey` step failed

[dentarg]

I think we can be more robust, and have retries for many steps.

Saw this happen:

Run curl --location https://packagecloud.io/cloudamqp/lavinmq/gpgkey | sudo apt-key add -
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)).

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0

100   919  100   919    0     0   2180      0 --:--:-- --:--:-- --:--:--  2180
gpg: no valid OpenPGP data found.
Error: Process completed with exit code 2.