Add documentation for building custom Presidio Docker images

[Bhavan790]

Summary

This PR adds comprehensive documentation on how to build custom Presidio Docker images with support for additional languages.

Issue

Closes #1663

Changes

• Added docs/building_custom_docker_images.md
• Documentation covers:
  • Key configuration files to modify
  • Step-by-step guide to enable language support (German example)
  • NLP backend options (Spacy vs Stanza)
  • Docker build process
  • Common issues and solutions
  • Testing instructions

How to Test

1. Review the new documentation file
2. Verify the formatting is correct
3. Check that the examples are clear

Related Issues

Resolves #1663

[Copilot]

Pull request overview

This PR adds a new documentation page intended to guide users through building custom Presidio Docker images with support for additional languages (e.g., enabling German recognizers) and alternative NLP backends.

Changes:

• Added a new doc page: docs/building_custom_docker_images.md
• Introduced an example flow for enabling German recognizers via default_recognizers.yaml

Comments suppressed due to low confidence (3)

docs/building_custom_docker_images.md:27

• Most Markdown syntax is escaped (e.g., \#, \##, \-, \*, and presidio\_analyzer), which will render as literal backslashes instead of headings/lists/emphasis in MkDocs. These escapes should be removed so the page renders correctly as Markdown.

\# Building Custom Presidio Docker Images



\## Overview



This guide explains how to build custom Presidio Docker images with support for additional languages beyond English.



\*Common Use Cases:\*

\- Add German, Spanish, French language support

\- Use different NLP backends (Spacy vs Stanza)

\- Optimize for production deployments

docs/building_custom_docker_images.md:103

• The YAML example inside the fenced code block contains literal   entities and leading backslashes (e.g., \- name:), so it is not valid YAML when copied. Replace the entities with real spaces, remove the backslashes, and keep normal YAML indentation so users can copy/paste the snippet.

```yaml

\- name: DeTaxIdRecognizer

  supported\_languages:

  - de

  type: predefined

  enabled: true



\- name: DePassportRecognizer

  supported\_languages:

  - de

  type: predefined

  enabled: true

docs/building_custom_docker_images.md:105

• The PR description says this doc covers NLP backend options, Docker build process, common issues/solutions, and testing instructions, but the current file ends right after the initial default_recognizers.yaml enablement example. Either expand the document to include the promised sections or adjust the PR description to match the current scope.

\### Example: Add German Language Support



1\. Open presidio-analyzer/presidio\_analyzer/conf/default\_recognizers.yaml



2\. Find the "Germany recognizers" section (around line 312)



3\. Change enabled: false to enabled: true:



```yaml

\- name: DeTaxIdRecognizer

  supported\_languages:

  - de

  type: predefined

  enabled: true



\- name: DePassportRecognizer

  supported\_languages:

  - de

  type: predefined

  enabled: true

[Bhavan790]

Ready for review

[Bhavan790]

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