Restructure docker

[jicarretero]

Proposed changes

The creation of Dockerfiles (base and the final one) has been rewriten. In the first case (base Docker image), things have been refactored and rewriten in a more appropriate way. In the second one (Orion-ld docker image) things have been better copied in order to produce a much smaller docker image

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• [ X] Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

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• [ X] I have signed the CLA
• [ X] I have added tests that prove my fix is effective or that my feature works
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[github-actions]

CLA Assistant Lite bot All contributors have signed the CLA ✍️

[jicarretero]

I have read the CLA Document and I hereby sign the CLA

[kzangeli]

Never mind the errors with Mintaka.
It doesn't work, never really did: it uses to fail like once every three attempts.
Lately it's more like it falis three times every three attempts ... :(

[kzangeli]

One error in the functests. It's a known error, on "expiresAt" set to June 1 2024 (a few days ago).
It's really not an error and I have fixed it already.
Merging