ci: build without sccache when S3 credentials are unavailable#623
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Dependabot- and fork-triggered workflow runs do not receive Actions secrets, so sccache started with empty S3 credentials and hard-failed every job with InvalidAccessKeyId. Gate RUSTC_WRAPPER on the secret being present (set once at workflow level instead of per step) and skip the sccache setup step when credentials are missing, so those runs build without the compile cache instead of failing. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Summary
All five open dependabot PRs fail CI identically: workflow runs triggered by Dependabot (and forks) do not receive Actions secrets, so
SCCACHE_S3_ACCESS_KEY_ID/SECRETare empty and sccache hard-fails server startup withInvalidAccessKeyIdagainst the MinIO backend, killing every job at the firstcargo clippy.Changes
RUSTC_WRAPPERonce at workflow level, gated on the secret being present (sccachewhen available, empty string otherwise — cargo ignores an empty wrapper). Replaces the 16 per-stepRUSTC_WRAPPER: sccachelines.Setup sccachesteps when credentials are missing, so the action's post-job stats step doesn't fail the same way.Dependabot/fork PRs now build without the compile cache (slower but green); runs with secrets are unchanged.
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