Proposed Julia Docker workflow to use a "persistent" depot

Tooling
8

Use the depot stack? See the DEPOT_PATH variable in Julia or use the JULIA_DEPOT_PATH environment variable.

https://docs.julialang.org/en/v1/manual/environment-variables/#JULIA_DEPOT_PATH

https://docs.julialang.org/en/v1/base/constants/#Base.DEPOT_PATH

Only the first depot is writable. The others should be read only.