docs: clarify DB env overrides

[dex-the-ai]

Summary

• update the README setup instructions to mention the supported DB_CONN_STR, DB_USERNAME, and DB_PASSWORD environment-variable overrides
• keep this sweep change intentionally small and doc-focused because the larger dependency refresh is already covered by maintainer PR chore(deps): update .NET dependencies #145

Verification

• docker run --rm -v /home/elliot/.openclaw/state/tutorial-maintenance/repos/aspnet-quickstart:/repo -w /repo mcr.microsoft.com/dotnet/sdk:8.0 bash -lc "dotnet restore Org.Quickstart.sln && dotnet build Org.Quickstart.sln --configuration Debug --no-restore" → build passed
• docker run --rm -e DB_CONN_STR -e DB_USERNAME -e DB_PASSWORD -v /home/elliot/.openclaw/state/tutorial-maintenance/repos/aspnet-quickstart:/repo -w /repo mcr.microsoft.com/dotnet/sdk:8.0 bash -lc "dotnet restore Org.Quickstart.sln && dotnet test src/Org.Quickstart.IntegrationTests/Org.Quickstart.IntegrationTests.csproj --configuration Debug --verbosity normal" → environment-blocked by missing travel-sample bucket on the configured Couchbase target
• containerized app run at http://127.0.0.1:18080 rendered Swagger successfully:
  • GET /swagger/v1/swagger.json → 200 OK, OpenAPI 3.0.4, 7 paths
  • GET /index.html → Swagger UI rendered successfully
  • GET /api/v1/airport/list?country=France&limit=1 → 500 InternalServerError with Ensure that you have the travel-sample bucket loaded in the cluster.
• detailed notes: tutorial-maintenance/runs/aspnet-quickstart/2026-07-07T094906-0700/verification.md

Evidence

• README now matches the actual runtime behavior used by local/dev container workflows: DB settings can come from appsettings.Development.json or the DB_* environment variables.
• Visual proof from the running Swagger surface:
  • tutorial-maintenance/runs/aspnet-quickstart/2026-07-07T094906-0700/screenshots/swagger-ui.png
  • tutorial-maintenance/runs/aspnet-quickstart/2026-07-07T094906-0700/video/swagger-ui.webm
• Request notes captured in tutorial-maintenance/runs/aspnet-quickstart/2026-07-07T094906-0700/walkthrough.txt

Notes

• The host only has the .NET 10 runtime installed, so the verification for this run used Dockerized .NET 8 instead of native dotnet test.
• I did not duplicate the dependency refresh already open in PR chore(deps): update .NET dependencies #145; this branch is just the honest README drift fix surfaced during the sweep.

Media evidence

• Swagger UI screenshot and short walkthrough video captured from the running app on this branch.

Notes

• Local artifact path: tutorial-maintenance/runs/aspnet-quickstart/2026-07-07T094906-0700/screenshots/swagger-ui.png

Swagger Ui

Notes

• Local artifact path: tutorial-maintenance/runs/aspnet-quickstart/2026-07-07T094906-0700/video/swagger-ui.webm

[dex-the-ai]

Owner ping for this maintenance PR: @azaddhirajkumar

Requesting review from the manifest-listed owner(s) where GitHub does not already show a pending review request.

[gemini-code-assist]

Code Review

This pull request updates the README.md to document the support for overriding default Couchbase configuration values using the DB_CONN_STR, DB_USERNAME, and DB_PASSWORD environment variables. The review feedback correctly points out that all three environment variables must be set simultaneously for the override to take effect, and suggests updating the documentation to reflect this requirement accurately.

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