chore: use transformerdocker image that is publicly available

[lvrach]

Description

While testing rudder-server in codespaces I got an error when try to run docker-compose up.

The docker image we are using requires to login to our docker hub.

I've used a public image to make development of rudder-server more acesible.

Notion ticket

https://linear.app/rudderstack/issue/PIPE-367/use-public-transformer-image-in-docker-compose-file

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (f13dbc3) 70.39% compared to head (666fb10) 70.37%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3916      +/-   ##
==========================================
- Coverage   70.39%   70.37%   -0.02%     
==========================================
  Files         357      357              
  Lines       53639    53639              
==========================================
- Hits        37758    37750       -8     
- Misses      13615    13622       +7     
- Partials     2266     2267       +1     

see 5 files with indirect coverage changes

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[atzoum]

what about the others changed by #3115?