Add CONTEXT_PATH support for sub-path deployments

[spike83]

Implements issue #3728: allow running behind a reverse proxy under a sub path by configuring servlet mappings and UI base href via CONTEXT_PATH.

[Copilot]

Pull request overview

This PR adds support for deploying the application behind a reverse proxy under a sub-path by introducing a CONTEXT_PATH environment variable. The implementation modifies servlet URL mappings, copies UI assets to the configured sub-path, and injects base href tags for proper relative link resolution.

Changes:

• Added CONTEXT_PATH environment variable configuration with path normalization and validation
• Implemented startup script logic to rewrite web.xml servlet mappings and set up UI assets under the configured sub-path
• Added documentation explaining CONTEXT_PATH usage and filesystem write requirements

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated no comments.

File	Description
docs/src/main/resources/templates/docker.html	Documents the new CONTEXT_PATH variable, its behavior, and filesystem write requirements when enabled
core/docker/usr/local/tomcat/bin/docker-start-print	Implements path normalization, validation, and applies context path by rewriting web.xml and copying UI assets

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[sebr72]

@spike83 I have assign to review your PR. But it is not successfully building. Could you please fix you PR, then I will review it.

[sebr72]

@sbrunner Could we do sthg about Pull request links that never stops running ?

[sbrunner]

@sebr72 I just blacklist 'issue' to be a Jira project.