Conditional embedding cardano cli in docker image

[sfauvel]

Content

By default, build docker images (aggregator and signer) without Cardano CLI which is useless when using Pallas.

We can embed it setting to 1 the build arg EMBED-CARDANO-CLI.

Example:
docker build -t mithril/mithril-aggregator --build-arg EMBED-CARDANO-CLI=1 -f mithril-aggregator/Dockerfile .

Pre-submit checklist

• Branch
  • Tests are provided (if possible)
  • Crates versions are updated (if relevant)
  • CHANGELOG file is updated (if relevant)
  • Commit sequence broadly makes sense
  • Key commits have useful messages
• PR
  • No clippy warnings in the CI
  • 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)

Issue(s)

Closes 1725

[github-actions]

Test Results

    4 files  ±0     51 suites  ±0   8m 54s ⏱️ +6s
1 101 tests ±0  1 101 ✅ ±0  0 💤 ±0  0 ❌ ±0 
1 249 runs  ±0  1 249 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 4e6e69f. ± Comparison against base commit ed03ede.

♻️ This comment has been updated with latest results.

[jpraynaud]

LGTM