chore(ci): speed up pipeline — NuGet cache + prebuilt Playwright image #73

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not · 2026-07-13T13:25:39Z

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2026-07-13 13:25:39 +00:00

Problem

CI runs sequentially on the single self-hosted runner, so wall-clock ≈ the sum of all jobs (~17 min). Two low-risk speedups need no infra change:

NuGet is not cached. Each of the 5 .NET jobs (lint, build, unit, mutation) restores packages from the network. There are no lock files / no central package management, so setup-dotnet's built-in cache doesn't apply — use actions/cache on ~/.nuget/packages keyed on **/*.csproj.
Playwright browsers are downloaded every e2e run. infra/run-e2e-check.sh uses node:24 + npx playwright install --with-deps chromium (~150 MB) on each verify-stack. Switch to the prebuilt mcr.microsoft.com/playwright:v1.61.1-noble image (browsers baked; version kept in sync with tests/e2e/package.json).

Scope (this issue)

Quick wins only — keep the serial single-runner layout. Parallelism (add a runner / raise capacity) is deferred as a separate infra decision.

Done when

NuGet packages cached across .NET jobs.
e2e uses the prebuilt Playwright image, no runtime browser download.
Pipeline stays green; docs/frontend-decisions.md note about "no image pinning" updated to reflect the new trade-off.

## Problem CI runs sequentially on the single self-hosted runner, so wall-clock ≈ the sum of all jobs (~17 min). Two low-risk speedups need no infra change: - **NuGet is not cached.** Each of the 5 .NET jobs (lint, build, unit, mutation) restores packages from the network. There are no lock files / no central package management, so setup-dotnet's built-in cache doesn't apply — use `actions/cache` on `~/.nuget/packages` keyed on `**/*.csproj`. - **Playwright browsers are downloaded every e2e run.** `infra/run-e2e-check.sh` uses `node:24` + `npx playwright install --with-deps chromium` (~150 MB) on each `verify-stack`. Switch to the prebuilt `mcr.microsoft.com/playwright:v1.61.1-noble` image (browsers baked; version kept in sync with `tests/e2e/package.json`). ## Scope (this issue) Quick wins only — keep the serial single-runner layout. Parallelism (add a runner / raise capacity) is deferred as a separate infra decision. ## Done when - NuGet packages cached across .NET jobs. - e2e uses the prebuilt Playwright image, no runtime browser download. - Pipeline stays green; `docs/frontend-decisions.md` note about "no image pinning" updated to reflect the new trade-off.

not added this to the Iteration 1 — Walking Skeleton milestone 2026-07-13 13:25:39 +00:00

not added the area:infra type:chore labels 2026-07-13 13:25:39 +00:00

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2026-07-13 13:29:16 +00:00

ci: cache the NuGet package store across the .NET jobs (refs #73)

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2026-07-13 13:29:16 +00:00

ci(e2e): run Playwright from the prebuilt image instead of downloading browsers (refs #73)

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2026-07-13 13:29:31 +00:00

ci: speed up pipeline — NuGet cache + prebuilt Playwright image #74

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