Have Julia nightly toolchain

[giordano]

I see there are nightly versions of some toolchains in Compiler Explorer, what would we need to do to have also the nightly version of Julia in here? Are nightly versions automatically updated periodically?

CC: @vchuravy.

[partouf]

Ok, I added the install for the nightly, will be refreshed every day and is located at /opt/compiler-explorer/julia-nightly
Will need an entry in the main repo in the etc/config/julia properties

[giordano]

That was quick, thanks a lot! I presume this compiler-explorer/compiler-explorer#6283 should be the corresponding PR for compiler-explorer?