chore: add .dockerignore file

[V-Gira]

Description

https://wearezeta.atlassian.net/browse/WPB-19219

add a .dockerignore file to remove development related dependencies from the built docker image

Checklist

• mentions the JIRA issue in the PR name (Ex. [WPB-XXXX])
• PR has been self reviewed by the author;
• Hard-to-understand areas of the code have been commented;
• If it is a core feature, unit tests have been added;

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (release/q2-2025@65a79d0). Learn more about missing BASE report.

Additional details and impacted files

@@                Coverage Diff                 @@
##             release/q2-2025   #19397   +/-   ##
==================================================
  Coverage                   ?   45.78%           
==================================================
  Files                      ?     1036           
  Lines                      ?    28429           
  Branches                   ?     6384           
==================================================
  Hits                       ?    13017           
  Misses                     ?    13798           
  Partials                   ?     1614           

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[emil-wire]

lgtm