Put the Dockerfile in the generated image

[pont-us]

Closes #55 .

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.40%. Comparing base (e372d9e) to head (287cc5c).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #70   +/-   ##
=======================================
  Coverage   84.40%   84.40%           
=======================================
  Files           6        6           
  Lines         558      558           
  Branches       64       64           
=======================================
  Hits          471      471           
  Misses         80       80           
  Partials        7        7           

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