feat(serverless): make run image configurable in container deploy command

[cyclimse]

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Hello there!

I often use scw container deploy, but it's a bit annoying to not be able to override the packer run-image when needing specific tools installed in the container (stuff to debug network issues, for instance). Ideally, one could overwrite the run-image to inject their own. Currently we rely on the builder's default.

Release note for CHANGELOG:

Add `run-image=` argument to `scw container deploy` command to be able to override the final Serverless container environment

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.13%. Comparing base (d4fb5bf) to head (d12a02f).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5229   +/-   ##
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  Coverage   57.13%   57.13%           
=======================================
  Files         313      313           
  Lines       69977    69982    +5     
=======================================
+ Hits        39982    39987    +5     
  Misses      28500    28500           
  Partials     1495     1495           

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