CI error: Path to conda environment is not valid

Today my integration tests fail with:

Run julia-actions/julia-runtest@v1
Run echo "JULIA_PKG_SERVER_REGISTRY_PREFERENCE=${JULIA_PKG_SERVER_REGISTRY_PREFERENCE:-eager}" >> ${GITHUB_ENV}
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
Stacktrace:

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

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