#7424 by @kubouch introduced the environment variable FILE_PWD which is set to the directory where the script is.
This feature is much appreciated.

However, I would suggest giving this variable a different name.
pwd is a known Unix command, but it stands for "print working directory".
The "print" doesn't make a lot of sense here.
Also, the name pwd is not very descriptive.

I would instead suggest using FILE_WORKDIR or (if brevity is the priority) FILE_WD.