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Fix from opsen (Pull request runs made obsolete by a newer push).

In northwind/mobile-ios, the GitHub Actions workflow .github/workflows/build.yml has no concurrency group. When someone pushes to an open pull request, the run for the previous commit keeps going alongside the new one. opsen measured 96 such runs and 2,210 wasted runner minutes in the last 30 days, about $137.00 a month.

Make this change:
1. Open .github/workflows/build.yml.
2. Add a top-level concurrency block that cancels in-progress runs only for pull requests, so pushes to branches and deploys are never cancelled:
   concurrency:
     group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
     cancel-in-progress: ${{ github.event_name == 'pull_request' }}
3. If the workflow already defines concurrency for some jobs, keep their groups and add the top-level block only if it does not conflict.
4. Keep every other line, comment and formatting as it is.

Check: the file is valid YAML, actionlint reports nothing new, and no job that deploys or publishes is affected.
Open a pull request titled "ci: cancel superseded pull request runs in build.yml".
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Plans for northwind

opsen pays for itself, and the math is on one page.

You pay from what it saves: $0.40 per merged pull request, never more than 25% of the savings. Nothing saved, nothing billed.

Return on the fee4.0×$562 saved for $140.47 a month
Your numbers, workedThe monthly run-rate of changes applied through opsen and still in effect.
Saved by opsen$562a month
fee is the lower of
Pull requests1,859 × $0.40= $743.60
or
Savings cap25% × $562= $140.47
=
Your fee, set by the savings cap$140.47a month
25% cap
Fee $140.47You keep $421 a month$5,057 a year
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No seat licences

The fee follows merged pull requests, not headcount. Adding engineers never adds a licence.

Capped at 25% of savings

Each month you pay the lower of the pull request count or 25% of what opsen saved.

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