Fix version builds still not working properly

[andreiciortea]

This PR adds an install section in jitpack.yml to handle versions passed through environment variables.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.64%. Comparing base (c79ef4f) to head (6c1b61a).
⚠️ Report is 21 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #268   +/-   ##
=========================================
  Coverage     87.64%   87.64%           
  Complexity      507      507           
=========================================
  Files            43       43           
  Lines          1910     1910           
  Branches        254      254           
=========================================
  Hits           1674     1674           
  Misses          160      160           
  Partials         76       76           

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