fix: activate a temp environment when a sysimage is enabled #2700
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Starting with Julia 1.8, the sysimage internal manifest (here on
Ⅿ₀
) is included in every Pkg resolution. So, a new, fresh manifest is equivalent toⅯ₀
∪∅
. This is strictly better than the "default" manifest that can be inconsistent with theⅯ₀
, or may include packages that will interfere with the new packages we want to add (e.g. an old version of a package that the package you're adding is depending on).To address that, the proposal is to instantiate a fresh manifest (
temp=true
) instead of the default.