chore: add studioctl local configuration

[martinothamar-agent]

Summary

• Adds a Development-only app startup hook that imports local harness configuration from studioctl app env --json --project <app>.
• Skips the hook when the app was already launched by studioctl via STUDIOCTL_APP_RUN.
• Keeps app-lib coupled only to studioctl's flat JSON env-var contract and logs warnings instead of failing app startup if studioctl is missing or returns bad output.

Why

This lets IDE/debugger launches get the same local platform configuration as studioctl run, while still keeping studioctl run as the source of truth for local harness values.

Testing

• Installed/verified studioctl v0.1.0-preview.13.
• dotnet csharpier check src/Altinn.App.Api/Extensions/WebHostBuilderExtensions.cs src/Altinn.App.Api/Extensions/StudioctlLocalConfiguration.cs test/Altinn.App.Api.Tests/Extensions/WebHostBuilderExtensionsTests.cs
• dotnet test test/Altinn.App.Api.Tests/Altinn.App.Api.Tests.csproj --filter "FullyQualifiedName~WebHostBuilderExtensionsTests" -v minimal
  • Passed: 9/9.
• dotnet build solutions/All.sln -v minimal
  • Passed with existing NU1903 warnings in analyzer/benchmark projects.
• Manual martinotest project-reference smoke test:
  • studioctl run -p /data/home/code/apps/martinotest-app-lib-pr started the app on a random host port and routed through http://local.altinn.cloud:8000/ttd/martinotest/.
  • dotnet run --project App/App.csproj --launch-profile AppRef --no-build imported studioctl config, bound a random host port, and was discoverable through studioctl app ps.

Integration test note

I also reproduced a PDF integration failure locally, but it reproduces the same way on clean upstream/main at 3c666448.

Command:

dotnet test test/Altinn.App.Integration.Tests/Altinn.App.Integration.Tests.csproj --filter "FullyQualifiedName~InstanceLocking.InstanceLockTests.ProcessNext_ConcurrentRequests_OneRequestGetsConflict" -v minimal

Result on both this branch and clean upstream main: the app receives a 500 from localtest-pdf3 after about 30 seconds. PDF container logs show Chromium failing to load frontend CDN assets with ERR_CERT_AUTHORITY_INVALID, then timing out waiting for #readyForPrint:

Failed to load resource: net::ERR_CERT_AUTHORITY_INVALID url:https://altinncdn.no/toolkits/altinn-app-frontend/4/altinn-app-frontend.css
Failed to load resource: net::ERR_CERT_AUTHORITY_INVALID url:https://altinncdn.no/toolkits/altinn-app-frontend/4/altinn-app-frontend.js
Wait condition not satisfied within timeout waitFor="#readyForPrint"
status_code=500 detail="waitFor element not ready within timeout: failed waiting for condition: timeout"

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ℹ️ Review info

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Configuration used: Organization UI

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Run ID: bb9371d7-d6c1-454a-9978-b9afb9d5474b

📥 Commits

Reviewing files that changed from the base of the PR and between 3c66644 and 3ca8502.

📒 Files selected for processing (3)

• src/Altinn.App.Api/Extensions/StudioctlLocalConfiguration.cs
• src/Altinn.App.Api/Extensions/WebHostBuilderExtensions.cs
• test/Altinn.App.Api.Tests/Extensions/WebHostBuilderExtensionsTests.cs

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• Create PR with unit tests

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