Caching yarn packages when building the Docker image

[mlqn]

Description

Our current Docker image downloads all yarn packages each time a new build occurs (new commit, new deployment, etc).

I suggest caching yarn packages by copying our package.json and yarn.lock files in a separate command. This should considerably reduce the build time of the Docker image.

Here is an example of a possible solution:

COPY ./package.json yarn.lock ./
...
RUN corepack enable
RUN yarn --immutable

COPY . .
RUN yarn build

https://docs.docker.com/build/cache/

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