[Home Assistant Add-on] Build failure on amd64: $BUILD_FROM is blank and deprecated 'arch' values

[TomSuperHero124]

The Home Assistant Supervisor is unable to build the TadoLocal Server add-on (version 1.1.2). The build process fails during the Docker image creation because the required BUILD_FROM argument is empty.

Log:
span_5[supervisor.docker.addon] Starting build for bff476a8/amd64-addon-tado-local-server:1.1.2span_5
span_6[supervisor.docker.manager] Running command ... --build-arg 'BUILD_ARCH=amd64'span_6
...
span_7#1 WARN: InvalidDefaultArgInFrom: Default value for ARG $BUILD_FROM results in empty or invalid base image namespan_7
Dockerfile:2

1 | span_8ARG BUILD_FROMspan_8
2 | >>> span_9FROM $BUILD_FROMspan_9

span_10ERROR: failed to build: failed to solve: base name ($BUILD_FROM) should not be blankspan_10

Steps to reproduce:

1. Add the repository https://github.com/AmpScm/TadoLocal to Home Assistant. 
2. Attempt to install TadoLocal Server version 1.1.2 on an amd64 system. 
3. Installation fails with a Docker build error.

System Information:
• Home Assistant Environment: Supervisor 
• Add-on Version: 1.1.2 
• Target Architecture: amd64 
• Date of Log: 2026-04-14

[Bekkie]

Did you update to the latest HA OS and HA Supervisor version? Recently the default BUILD_ARCH definition have been updated.
That is why "aarch64" has been added to config.yaml.

This commit did not change anything to the $BUILD_FROM values, they are generated by HA

[AlexHunterCodes]

Can confirm the same behaviour on my instance, see versions and logs below.

From 2026.4 onwards, add-ons/apps are built using Docker BuildKit and Home Assistant's custom builder has been removed.

https://developers.home-assistant.io/blog/2026/04/02/builder-migration/

The legacy builder used to provide the $(BUILD_FROM) environment variable, but now apps use normal FROM statements to leverage Docker manifests for multi-architecture. It's still the same base image.

Changed it and tested it on my Raspberry Pi 4 (64-bit). Seems to work. Can I submit a PR?

AlexHunterCodes@f3c589b

Installation method	Home Assistant OS
Core	2026.4.4
Supervisor	2026.04.0
Operating System	17.2
Frontend	20260325.8

2026-04-30 21:39:23.980 ERROR (MainThread) [supervisor.addons.addon] Could not build image for app bff476a8_tado-local-server: Docker build failed for bff476a8/aarch64-addon-tado-local-server:1.1.2 (exit code 1). Build output:
#0 building with "default" instance using docker driver
#1 [internal] load build definition from Dockerfile
#1 transferring dockerfile:
#1 transferring dockerfile: 603B 0.0s done
#1 DONE 1.2s
 1 warning found (use docker --debug to expand):
 - InvalidDefaultArgInFrom: Default value for ARG $BUILD_FROM results in empty or invalid base image name (line 2)
Dockerfile:2
--------------------
   1 |     ARG BUILD_FROM
   2 | >>> FROM $BUILD_FROM
   3 |     
   4 |     RUN apk add git py3-pip
--------------------
ERROR: failed to build: failed to solve: base name ($BUILD_FROM) should not be blank

[Bekkie]

@AlexHunterCodes Thanks a lot for fixing this issue, took the liberty to create a PR and merge from your branch myself.

Issue fixed with PR #52