feat(deploy): INDEXERUI_BASE_PATH build-arg + bump indexer-ui submodule

[guimard]

Summary

Enables deploying indexer-ui under a subpath (e.g. /indexerui/) on the same vhost as the OpenRag backend. Needed by environments behind a single TLS-terminating reverse proxy where we want a single origin to avoid cross-origin cookie handling (and the SameSite pain that goes with it).

Changes

• docker-compose.yaml (service indexer-ui): forward INDEXERUI_BASE_PATH env to the container build as the BASE_PATH Docker build-arg.
• .env.example: document INDEXERUI_BASE_PATH (commented out, empty = root-level as today, rebuild required after change).
• extern/indexer-ui: bump submodule pointer to c967017 (the merged OIDC support on openrag-admin-ui@main).

Dependency

Pairs with linagora/openrag-admin-ui#19 (feat(base-path): subpath mounting via BASE_PATH env). Without that PR merged, setting INDEXERUI_BASE_PATH in .env has no effect — the build-arg is passed through compose but the Dockerfile it reaches doesn't read it yet. Merge #19, then bump the submodule pointer again in a follow-up to actually enable the feature.

Usage once both PRs land

# .env
INDEXERUI_BASE_PATH=/indexerui

# then:
docker compose build indexer-ui
docker compose up -d

Reverse proxy (nginx):

location /indexerui/ {
    proxy_pass http://indexer-ui:3000;   # NO trailing slash = path kept intact
}
location / {
    proxy_pass http://openrag-backend:8080;
}

Test plan

• docker compose config indexer-ui — build.args.BASE_PATH visible
• Empty INDEXERUI_BASE_PATH (default) → image builds with empty base, app still at root
• INDEXERUI_BASE_PATH=/indexerui → image builds with base=/indexerui, app reachable at <host>/indexerui/ through the proxy rule above

Summary by CodeRabbit

• New Features

  • Added support for serving indexer-ui under a custom subpath configuration.

• Documentation

  • Updated configuration examples and guidance for subpath setup; clarified that Docker rebuild is required after configuration changes.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 6680516f-1d86-4a10-9cb9-6668ec2908d8

📥 Commits

Reviewing files that changed from the base of the PR and between cac96f0 and c20ade3.

📒 Files selected for processing (1)

• docs/content/docs/documentation/setup_indexerui.md

📝 Walkthrough

Walkthrough

These changes enable serving indexer-ui under an optional subpath by updating environment variable documentation with new INDEXERUI_BASE_PATH guidance, adding a Docker build argument to pass this configuration, and updating the indexer-ui submodule to support this feature.

Changes

Cohort / File(s)	Summary
Configuration Documentation .env.example	Added commented guidance for INDEXERUI_BASE_PATH configuration variable, noting it is consumed as a Docker build ARG, requires image rebuild after changes, and is not read at runtime. Adjusted URL placeholder formatting and removed trailing whitespace.
Docker Infrastructure docker-compose.yaml	Added BASE_PATH build argument to indexer-ui service image build, reading from ${INDEXERUI_BASE_PATH:-} environment variable (defaults to empty string).
Dependencies extern/indexer-ui	Updated submodule pointer to a new commit (7616604a38dcdb0b254c5be3dd116e5982bcc278), presumably containing support for subpath-based serving via the new BASE_PATH argument.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Poem

🐰 With whiskers twitching, I celebrate today,
A subpath option comes to play!
Configuration blooms, the compose files align,
Our indexer-ui shall shine, oh so fine! 🎉

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately captures the main changes: adding INDEXERUI_BASE_PATH build-arg support and updating the indexer-ui submodule pointer, which aligns with the changeset across .env.example, docker-compose.yaml, and extern/indexer-ui.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/indexerui-base-path

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