Buildkite maintenance

These issues look like they can be addressed at the same time:

https://github.com/AlgebraicJulia/ACSets.jl/issues/165

https://github.com/AlgebraicJulia/Decapodes.jl/issues/314

https://github.com/AlgebraicJulia/CombinatorialSpaces.jl/issues/128

https://github.com/AlgebraicJulia/CombinatorialSpaces.jl/issues/124