Slow1 suite failed on suite instance deploy

### Description / Background

On 31/08/2026 the Slow1 suite failed in the nightly system test run. It failed deploying the suite instance with the following error:
Instance did not deploy: {{INSTANCE_ID}} - Command failed with exit code 1: docker buildx build --platform linux/amd64,linux/arm64 --push -t {{AWS_URL}}/{{INSTANCE_ID}}/base:0.37.5-SNAPSHOT

Full logs can be found in the S3 bucket

### Steps to reproduce

1. Check slow1.log for 31/08/2026 run
2. See error

### Expected behaviour

The suite should deploy. This ticket is to investigate what went wrong and what can be done to prevent it in future

Start by reviewing slow1.log for the 31/08/2026 nightly run and the full logs in the S3 bucket, focusing on the docker buildx command that failed during suite instance deployment. Trace the deployment failure and identify a preventive action; done means the cause is documented and the suite can deploy successfully in a verified run.

Written by the indexing model from the issue text.