Pre-build static docker images

[cbeauchesne]

Build step is very slow...

• get data on each image build time
• pre-build them, and use pre-build images

WIP

• cpp
• golang
• java
• nodejs [nodejs] add base images #2677
• php
• python: Optimize python build time  #1331
• ruby
  • almost done, missing node and npm, see Publish images based on ghcr.io/datadog/images-rb/engines/ruby with node and npm installed images-rb#28

[lloeki]

@cbeauchesne I'm finishing up DataDog/libddwaf#93 and I'll start tackling that.

[lloeki]

As we are adding more scenarios to run things get more duration sensitive, so I have started working on that, using dd-trace-rb as starting ground: DataDog/dd-trace-rb#2738

[cbeauchesne]

Actually not needed on ruby, as the base image has almost everything. We just need to rebuild rails images in API mode to avoid to install node / npm. See DataDog/images-rb#28