Prompt: Tell me how to use docker buildx to build for multiple arch?

## Results

- gemma3:12b
total duration:       1m1.302947696s
load duration:        65.995345ms
prompt eval count:    23 token(s)
prompt eval duration: 165.794483ms
prompt eval rate:     138.73 tokens/s
eval count:           1564 token(s)
eval duration:        1m1.070366757s
eval rate:            25.61 tokens/s


- qwen3:8b
total duration:       49.622220108s
load duration:        26.283593ms
prompt eval count:    24 token(s)
prompt eval duration: 105.955695ms
prompt eval rate:     226.51 tokens/s
eval count:           1530 token(s)
eval duration:        49.489224898s
eval rate:            30.92 tokens/s

- qwen3:14b

total duration:       1m28.851573437s
load duration:        27.431059ms
prompt eval count:    24 token(s)
prompt eval duration: 149.440144ms
prompt eval rate:     160.60 tokens/s
eval count:           2134 token(s)
eval duration:        1m28.673720769s
eval rate:            24.07 tokens/s