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To allow for more selective managed updates, allow the config hash and build time to be built into the image itself. To avoid triggering unneeded rebuilds, do this through a linker script so that the new config hash and timestamp are included only if the firmware is actually relinked. Add a _check_and_emit_buildinfo() step after building, which prints the information after the firmware was rebuilt. A subsequent commit will emit a manifest here, or at least the HMAC-MD5 for signing OTA updates using the hmac_key configured in this image.
