Fix GPG signing for GH Actions

[mpontes]

Deploy script needs access to the GPG/Maven Central related vars.

[codecov[bot]]

Codecov Report

Merging #92 (fb56992) into master (a501ae9) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #92   +/-   ##
=========================================
  Coverage     78.38%   78.38%           
  Complexity      338      338           
=========================================
  Files            49       49           
  Lines          1277     1277           
  Branches        153      153           
=========================================
  Hits           1001     1001           
  Misses          222      222           
  Partials         54       54           

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