Speed docker build up the build by 10X times for frontend applications

I'm developing on macOS, and my Kubernetes cluster is on linux.

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The configuration before was:

Dockerfile:

FROM node:14.17-alpine as a builder
...
FROM nginx
...

I ran the command:

docker build --platform linux/amd64 -t fe-spa:latest .

The assembly began to take 20 minutes

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I changed the configuration and started doing this:

Dockerfile:

FROM node:14.17-alpine as a builder
...
FROM --platform linux/amd64 nginx
...

I ran the command:

docker build -t fe-spa:latest .

The assembly began to take 2 minutes

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the transfer of the platform selection allowed us to get an increase in speed