Fix for Dockerfile smell DL3059

[grosa1]

Description

Hi!
The Dockerfile placed at "Dockerfile" contains the best practice violation DL3059 detected by the hadolint tool.

The smell DL3059 occurs if there are multiple consecutive RUN instructions. Each RUN will correspond to a layer of the final Docker image, thus is recommended to compact them to reduce the number of layers for the final image.
This pull request proposes a fix for that smell generated by my fixing tool. The patch was manually verified before opening the pull request. To fix this smell, specifically, The consecutive RUN instructions have been chained until a comment or a different instruction appears.

This change is only aimed at fixing that specific smell. If the fix is not valid or useful, please briefly indicate the reason and suggestions for possible improvements.

Thanks in advance

Purpose

This pull request is a:

• 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

• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

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