CI error: Path to conda environment is not valid

Today my integration tests fail with:

Run julia-actions/julia-runtest@v1
Run # The Julia command that will be executed
     Testing KiteControllers
ERROR: LoadError: Error building `PyCall`: 
ERROR: LoadError: ArgumentError: Path to conda environment is not valid: /home/runner/.julia/conda/3/x86_64

Full error: Update · aenarete/KiteControllers.jl@31cb82b · GitHub

This worked an hour ago, and I only changed the file.

Any idea what could be the reason and how to debug or fix it?

I re-triggered the tests and now all is fine.