docs: explain custom analyzer docker builds

[ded-furby]

Change Description

Document how to build a custom presidio-analyzer Docker image with alternate analyzer, NLP, and recognizer-registry YAML files.

The docs now include:

• which default YAML files ship in the published image
• how to copy and customize them inside the presidio-analyzer/ build context
• the exact docker build arguments needed to point the Dockerfile at those custom files
• common multilingual pitfalls, including supported_languages mismatches and NLP recognizer warnings
• links to the deeper analyzer configuration docs

Issue reference

Fixes #1663

Checklist

• I have reviewed the contribution guidelines
• I have signed the CLA (if required)
• My code includes unit tests
• All unit tests and lint checks pass locally
• My PR contains documentation updates / additions if required

Validation

This is a documentation-only change. I did not run the full Python test/lint suite because no runtime code changed.

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Updates installation documentation to explain how to build a custom presidio-analyzer Docker image using alternative YAML configuration files, and records the change in the changelog.

Changes:

• Added a new installation guide section for building a custom presidio-analyzer image with custom analyzer/NLP/recognizer-registry YAML files.
• Added configuration checks and troubleshooting pointers for multilingual analyzer setups.
• Updated CHANGELOG.md under [unreleased] to document the new guidance (fixes #1663).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
docs/installation.md	Adds step-by-step instructions for building and running a custom analyzer image with custom YAML configs and validation notes.
CHANGELOG.md	Documents the new installation guidance under the unreleased “General -> Changed” section.

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[ded-furby]

I’ve applied the two actionable review-thread items and pushed on branch :

• added an explicit note to run the custom Docker example from the repository root after cloning
• changed sample image tag from to neutral to avoid confusion about ownership

[ded-furby]

I’ve applied the two actionable review-thread items and pushed ec7bcaa on branch docs/issue-1663-custom-docker-image:

• added an explicit note to run the custom Docker example from the repository root after cloning
• changed sample image tag from presidio/presidio-analyzer-custom to neutral myorg/presidio-analyzer-custom to avoid confusion about ownership

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.