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Debug a Failing GitHub Actions Workflow

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Self-Hosting & Infra intermediate 8 min read $0.01 Updated 2026-10-19

A checklist for GitHub Actions failures: workflows that never run, YAML and expression errors, missing secrets and permissions, cache and dependency differences, path and shell issues, debug logging, re-running with SSH-free techniques and avoiding flaky tests.

The workflow will not trigger, fails only on the runner, or passes locally and fails in CI. Work out whether the problem is the trigger, the YAML, the environment, permissions or a flaky step.

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#github-actions#ci#debugging#workflows#yaml

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