Fix Dockerfile

[mariomac]

Replaced CMD by ENTRYPOINT in Beyla. This should be the standard way of specifying a container command.

This will cause that some docker-compose setups will break because this command value won't be valid anymore:

command:
- /beyla
- config-file.yml

The correct and standard way will be:

command:
- config-file.yml

Kubernetes deployments will still keep working because they accept either command for the whole CLI and args for the arguments.

I will document this as the very first item in the release notes.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b6dc92c) 79.19% compared to head (b81383d) 45.18%.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #551       +/-   ##
===========================================
- Coverage   79.19%   45.18%   -34.01%     
===========================================
  Files          69       67        -2     
  Lines        5815     5637      -178     
===========================================
- Hits         4605     2547     -2058     
- Misses        987     2939     +1952     
+ Partials      223      151       -72     

Flag	Coverage Δ
integration-test	?
unittests	45.18% <ø> (-0.06%)	⬇️

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[grcevski]

LGTM! Nice!