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feat(buildkit): add RAILPACK_BUILT_AT environment variable (#669)

- Add `RAILPACK_BUILT_AT` to runtime image environment containing Unix epoch seconds
- Document runtime Railpack environment variables and precedence rules
- Add unit tests verifying environment generation and cache isolation for deploy variables

Generated-by: aiautocommit

Michael Bianco committed 1mo ago

dfc82ce5fced3c669bea44ff4b162e2e86552533

Parent: 05ced98

Committed by GitHub <noreply@github.com> on 8/10/2026, 8:19:00 PM