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docs: say that concurrent jobs on one runner each need their own builder_name - #386

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docs: say that concurrent jobs on one runner each need their own builder_name#386
dash14 wants to merge 1 commit into
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docs/builder-name-uniqueness

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@dash14 dash14 commented Sep 13, 2026

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Summary

builder_name is what identifies the builder's containers, and setup tears down anything already running under that name before starting its own. Two jobs sharing a runner and the default name therefore destroy each other's builder, and the README never said so.

Changes

  • A note under the usage section: give each concurrent job on a self-hosted runner its own builder_name, and why a GitHub-hosted runner does not need it.

No behavioural change.

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