Improve the "okteto build" success message

[pchico83]

Proposed changes

• Show a success "push" message when the "-t" flag is used

[codecov]

Codecov Report

Merging #776 into master will decrease coverage by 0.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #776      +/-   ##
==========================================
- Coverage   31.95%   31.93%   -0.02%     
==========================================
  Files          62       62              
  Lines        4829     4831       +2     
==========================================
  Hits         1543     1543              
- Misses       3165     3167       +2     
  Partials      121      121

Impacted Files	Coverage Δ
cmd/build.go	0% <0%> (ø)	⬆️

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