OTP releases evaluate config at build time, not boot time.
DATABASE_URL must be read at runtime — the kohen sets it in
K8s secrets, not at compile time.
- Created config/runtime.exs with prod-only runtime config
- DATABASE_URL, L1_MOUNT_POINT, MANNA_PROVISION_FILE, HTTP_PORT
all readable from environment at boot
- prod.exs cleaned: removed System.get_env("DATABASE_URL") call
(was compile-time, now in runtime.exs)
- Added http_port: 4000 to prod defaults
Without this fix, the Docker image would fail to start — the
release would not find DATABASE_URL at boot.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
