chore: Optimize docker build oss

[gastonfournier]

About the changes

Reduce the build time of OSS docker image from ~30m to under 15m

1. Build frontend outside docker multiplatform.
2. Allow frontend/build to be copied to the image by removing this from .dockerignore
3. Run with --ignore-scripts to avoid building the frontend on the prepare script, but this requires us to run all the prepare scripts manually (except the frontend build).

Note: we need to build frontend in the prepare script to be able to have source code dependencies

Manual Testing

Manually downloaded from https://hub.docker.com/r/unleashorg/unleash-server/tags?page=1 and compared both unleash folders from main and the version built with the new process https://github.com/Unleash/unleash/actions/runs/5223078089/jobs/9429430190#step:5:48

No major difference was spotted (only expected changes due to development done in main)

Command used to extract the contents:

cd /tmp
mkdir main && cd main
docker pull unleashorg/unleash-server:main-edge-18-alpine
docker export $(docker create unleashorg/unleash-server:main-edge-18-alpine) > container.tar && tar xvf container.tar
mkdir ../new-process && cd ../new-process
docker pull unleashorg/unleash-server:sha-ccac902-18-alpine
docker export $(docker create unleashorg/unleash-server:sha-ccac902-18-alpine) > container.tar && tar xvf container.tar
meld ./unleash ../main/unleash

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2 Ignored Deployments

Name	Status	Preview	Comments	Updated (UTC)
unleash-docs	⬜️ Ignored (Inspect)			Jun 10, 2023 7:21pm
unleash-monorepo-frontend	⬜️ Ignored (Inspect)	Visit Preview		Jun 10, 2023 7:21pm

[chriswk]

I think the comments from Sonatype here make sense. We should probably join the three yarn runs here in a && pipeline. To avoid three temporary images.

[gastonfournier]

This enables us to run tests on this workflow without pushing the image

[chriswk]

Nice!

[chriswk]

LGTM. I like the opening for running it without pushing to dockerhub