Rejected pushes to gh-pages when using subdirs

[tpoisot]

I am trying to build documentations across several packages in a monorepo, and I very commonly run into the following issue:

 To github.com:PoisotLab/SpeciesDistributionToolkit.jl.git
 ! [rejected]        HEAD -> gh-pages (fetch first)
error: failed to push some refs to 'github.com:PoisotLab/SpeciesDistributionToolkit.jl.git'
hint: Updates were rejected because the remote contains work that you do not
hint: have locally. This is usually caused by another repository pushing to
hint: the same ref. If you want to integrate the remote changes, use
hint: 'git pull' before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.

Re-running the documentation tasks manually work, but isn't ideal (obviously).

Is there a workaround?