Fix unsuccessful setting of readonly bash variable by using different name than UID

[juhoinkinen]

In the wiki section for docker-compose.yml it was instructed to run command

ANNIF_PROJECTS=~/annif-projects UID=${UID} GID=${GID} docker-compose up

to start up the services, which set UID and GID variables which in turn were intended to be used for setting user in containers. However this was actually failing with the warning

bash: UID: readonly variable
WARNING: The UID variable is not set. Defaulting to a blank string.

and the user remained root in the containers.

This is fixed by using different name than UID in the docker-compose.yml and the instruction in Wiki.

[codecov]

Codecov Report

Merging #319 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #319   +/-   ##
=======================================
  Coverage   99.37%   99.37%           
=======================================
  Files          55       55           
  Lines        2867     2867           
=======================================
  Hits         2849     2849           
  Misses         18       18

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 2625edb...9807506. Read the comment docs.

[TommiRTVA]

I have noticed that this setting is not needed or even possible to set when using Docker for Windows?

"On Docker for Windows it is not necessary to change uid and gid in your .env file.
Docker for Windows is internally using network shares (SMB) to mount Docker volumes. This does not require to syncronize file and directoriy permissions via uid and gid."

https://devilbox.readthedocs.io/en/latest/howto/uid-and-gid/find-uid-and-gid-on-win.html