Print git branch in silkworm build

[AndreaLanfranchi]

No description provided.

[codecov]

Codecov Report

Merging #613 (11864ca) into master (9950241) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #613      +/-   ##
==========================================
- Coverage   81.73%   81.71%   -0.02%     
==========================================
  Files         167      167              
  Lines       13966    13966              
==========================================
- Hits        11415    11413       -2     
- Misses       2551     2553       +2     

Impacted Files	Coverage Δ
core/silkworm/crypto/sha-256.c	51.24% <0.00%> (-0.50%)	⬇️

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