[tlbuild] Apply to be loongarch64-linux volunteer builder

[张曦]

Hello TUG:

   Sorry for the last email, there is a typo in the subject.

    I want to become a volunteer builder for loongarch64-linux.
   I have successfully build it by "./Build --debug --disable-luajittex --disable-luajithbtex --enable-build-in-source-tree --disable-mfluajit"(Because luajit not be merged to upstream yet but it's coming). 
   What should I do to add it to the official network download channel.

Thanks.
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