Support download binaries for macOS in E2E test

[dlachaume]

Content

This PR includes an update of mithril-end-to-end.

mkfiles-init.sh has been modified to take account of the OS on which the command is run. It allows to download the cardano binaries on the right OS.

Pre-submit checklist

• Branch
  • Tests are provided (if possible)
  • Crates versions are updated (if relevant)
  • Commit sequence broadly makes sense
  • Key commits have useful messages
• PR
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  • Self-reviewed the diff
  • Useful pull request description
  • Reviewer requested
• Documentation
  • Update README file (if relevant)
  • Update documentation website (if relevant)
  • Add dev blog post (if relevant)

[github-actions]

Test Results

  3 files  ±0   42 suites  ±0   9m 0s ⏱️ -32s
909 tests ±0  909 ✅ ±0  0 💤 ±0  0 ❌ ±0 
998 runs  ±0  998 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 9969947. ± Comparison against base commit 5024ba4.

♻️ This comment has been updated with latest results.

[jpraynaud]

The detection of the platform should be automatic, which will simplify the code and avoid adding an extra configuration parameter 🙂

[jpraynaud]

LGTM 👍

[sfauvel]

Is it necessary to put this 2 commands in the same line ?
This can be more complicated to understand than having each instruction on one line.

[dlachaume]

I saw it was already done this way in this file. I guessed it was ok