patched some scripts to properly build the docker image

[jicarretero]

Proposed changes

I have modified some installation scripts for the docker, they have some issues which prevent them from properly building the docker image.

Types of changes

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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)

Checklist

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• [x] I have read the CONTRIBUTING doc
• [ ] I have signed the CLA
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have added necessary documentation (if appropriate)
• [ ] Any dependent changes have been merged and published in downstream modules

Further comments

This pull request only affects the Docker image generation. Nothing disruptive with the code here.

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[kzangeli]

So. we have a problem with permissions. Weird problem, as we haven't seen t before. So, I'm gonna go ahead and merge this PR even though it fails.

Why? Well, the PR fixes the BIG problem we had with the compilation of the base image. That's what's important.

Once merged, I'll play a little with it, see if I find out why we don't have enough permissions to push the base image. God knows I've been pushing "final" images to dockerhub/quay every day, a few times for years ...