fix: Podman compatibility by adding environment configurable repository prefix to Docker Compose image references

[Vchen7629]

Summary

Port of PR #1919 to target main instead of release-0.5.1 branch, Fixes #1206. Podman fails to resolve unqualified image names (no registry prefix) by default, causing podman pull/podman compose up to fail with: Error: short-name "langflowai/openrag-backend:latest" did not resolve to an alias and no unqualified-search registries are defined in "/etc/containers/registries.conf"

Changes

• Prefix all image references in docker-compose.yml with Added environment variable prefix that defaults to docker.io/ (5 images total: opensearch, opensearch-dashboards, backend, frontend, langflow) if none provided

Testing

• Verified on Windows 10 + WSL2 + Ubuntu 24.04 + Podman 4.9.3, image pulls and podman compose up now succeed
• Confirmed docker compose still works identically (fully-qualified docker.io/... and unqualified ... resolve to the same image on Docker Hub)
• Ran unit test suite

Summary by CodeRabbit

• Chores
  • Updated container image references to use fully qualified registry paths for core services.
  • No changes were made to ports, volumes, environment settings, or service behavior.

[coderabbitai]

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ℹ️ Recent review info

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Review profile: CHILL

Plan: Pro

Run ID: 4616f1e0-d5e6-42fa-b6f1-e80ab04b83c5

📥 Commits

Reviewing files that changed from the base of the PR and between 4f104ec and d79d3f5.

📒 Files selected for processing (1)

• docker-compose.yml

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Walkthrough

Updated docker-compose.yml to prefix five service image references (opensearch, dashboards, openrag-backend, openrag-frontend, langflow) with the fully-qualified docker.io/ registry path instead of unqualified image names.

Changes

Docker image path qualification

Layer / File(s)	Summary
Qualify service image references docker-compose.yml	Image references for opensearch, dashboards, openrag-backend, openrag-frontend, and langflow services updated to use fully-qualified docker.io/... paths.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Related issues: #1206 — Fixes OpenRAG TUI installation failure on Linux/Podman systems caused by unqualified image names lacking a registry prefix.

Suggested labels: bug

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title matches the main change: qualifying OpenRAG image references in docker-compose for Podman compatibility.
Linked Issues check	✅ Passed	Qualifying the five OpenRAG image references addresses the unqualified short-name failure described in #1206.
Out of Scope Changes check	✅ Passed	The diff stays within the requested docker-compose image reference fix and adds no unrelated changes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch openrag-install-linux-vm-fix

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