Explicitly set image platform in Dockerfile

[WouterSpaak]

When running the OMOTES system on Macbook M4 Silicon, the following warnings are being reported by Docker:

 ! grow_worker_optimizer_with_pressure The requested image's platform (linux/amd64) does not match the detected host platform (linux/arm64/v8) and no specific platform was requested                 0.0s 
 ! grow_worker_optimizer_no_heat_losses The requested image's platform (linux/amd64) does not match the detected host platform (linux/arm64/v8) and no specific platform was requested                0.0s 
 ! omotes_simulator_worker The requested image's platform (linux/amd64) does not match the detected host platform (linux/arm64/v8) and no specific platform was requested                             0.0s 
 ! grow_worker_simulator The requested image's platform (linux/amd64) does not match the detected host platform (linux/arm64/v8) and no specific platform was requested                               0.0s 
 ! grow_worker_optimizer The requested image's platform (linux/amd64) does not match the detected host platform (linux/arm64/v8) and no specific platform was requested                               0.0s 
 ! orchestrator The requested image's platform (linux/amd64) does not match the detected host platform (linux/arm64/v8) and no specific platform was requested     

This can be fixed by explicitly declaring the platform value to be linux/amd64 in docker-compose.yml files:

#snip
  grow_worker_optimizer: &grow_worker
    image: ghcr.io/project-omotes/omotes-grow-optimizer-worker:2.0.10
    **platform: linux/amd64**
    restart: unless-stopped
    deploy:
      replicas: 2
      resources:
        limits:
          cpus: "4"
          memory: 4gb
    memswap_limit: 4gb