[Feat] Use common layers/dockerfile for Ubuntu wxGUI docker image #6512
Description
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Now, we are using different Dockerfiles for Ubuntu and Ubuntu with wxPython GUI. The Dockerfile for Ubuntu already contains stages to build a GUI image, but is unused. Now that we build some core dependent libraries from source, we might as well reuse them as much as possible.
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By carefully designing the layers of the common build stages, we could reuse layers as is for both images, and install additional gui libraries later on (adding a layer with more dependencies). All layers (and stages) before our grass compilation should be common in both images.
Also make sure that the cache scope allows sharing of both. Otherwise, if really not possible, build both images in the same job, so the build cache exists on the host.
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