Drop the deprecating command `set-env` in actions workflow.
Drop the deprecating command `set-env` in actions workflow.

replace with environment files

mohuk/mohuk.github.io,aaronisme/aaronisme.github.io,mohuk/mohuk.github.io,mohuk/mohuk.github.io,aaronisme/aaronisme.github.io,aaronisme/aaronisme.github.io,mohuk/mohuk.github.io,aaronisme/aaronisme.github.io