Rust pop-quiz answer: Configuring reading configuration files by git branches

#Rust pop-quiz answer to configuring reading configuration files by git branches.

code 

I've inlined a branch-parameter into reading REST resources. This came about whilst doing work on pivot-trading. 

Bonus cryptocurrency pop-quiz: configure location of lsd-configuration file

Bonus to adding $stTIA to the lsd-configuration pop-quiz: Configure reading the configuration file from branches other than main.

What do I mean by this?

./lsd doesn't have configuration to locate the lsd-configuration-file, so testing can only occur in main (??!)

Pass the branch-name to ./lsd

• (answer)