Document Dockerfile build secret limitations#1158
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Dockerfile builds document ARG usage and cache mounts, but do not state that Railway service variables are not bound as Docker BuildKit secrets. Add a warning that RUN --mount=type=secret is not available for service variables in Dockerfile builds, and that sealed variables can still appear in logs if a Docker RUN command expands and prints them. Constraint: Public Railway staff guidance says Dockerfile BuildKit secret mounts are not supported for this path Rejected: Recommend RUN --mount=type=secret | unsupported for Dockerfile builds on Railway Confidence: medium Scope-risk: narrow Directive: Revisit this warning if Railway adds Dockerfile BuildKit secret binding Tested: git diff --check; pnpm exec content-collections build Not-tested: Full Next.js site build
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Summary
type=secretmountsRUNcommand expands themARGguidance but make the secret-handling limitation explicitRelated Central Station question: https://station.railway.com/questions/does-railway-support-run-mount-type-se-aa6a8782
Verification
git diff --checkpnpm exec content-collections build