Using org-level DOCUMENTER_KEY

[timholy]

In my lab's organization, we have several packages that lack their own documenter documentation, and so don't have a public/private key/secret pair for documenter. However, we do have an organization-level DOCUMENTER_KEY. One example of such a package is https://github.com/HolyLab/ExtractPSF.jl. I have CompatHelper set up but it fails. Here's the relevant section of the log:

Run import CompatHelper
  import CompatHelper
  CompatHelper.main()
  shell: /usr/bin/julia --color=yes {0}
  env:
    GITHUB_TOKEN: ***
    COMPATHELPER_PRIV: ***
Cloning into '/tmp/jl_Zl4CYh/REPO'...
Already on 'master'
Your branch is up to date with 'origin/master'.
Cloning into '/tmp/jl_b88E8j/General'...
[ Info: EnvVar `COMPATHELPER_PRIV` is defined, nonempty, and not `false`
[ Info: This doesn't look like a raw SSH private key. I will assume that it is a Base64-encoded SSH private key. I will now try to Base64-decode it.
[ Info: This was a Base64-encoded SSH private key. I Base64-decoded it, and now I have the raw SSH private key.
Cloning into 'REPO'...
Warning: Permanently added the RSA host key for IP address '140.82.112.4' to the list of known hosts.
git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

and so on.

I'm wondering if there's an easy way around this, short of setting up keys for each individual repository? (There are ~20 such repos, so it would be nice to solve this at the organization level.)