fix(docker): reduce binary size + speed up build

[corrieriluca]

• Use -s -w to strip debug symbols. On Linux/ARM64 burrito binary goes from ~120MB to ~80MB.
• Remove -a option to go build because it was rebuilding all the packages from scratch, thus not using the cache. This will speed up builds on local machines.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 50.04%. Comparing base (86c82f2) to head (b2ede63).
Report is 4 commits behind head on main.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #492   +/-   ##
=======================================
  Coverage   50.04%   50.04%           
=======================================
  Files          72       72           
  Lines        4806     4806           
=======================================
  Hits         2405     2405           
  Misses       2198     2198           
  Partials      203      203           

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