Compute SHA in a separate job step

[Lipen]

This PR improves GHA workflow for triggering JitPack build by extracting the computation of short (of length 10) SHA into a separate job step. This allows for observing the actual 10-digit sha in CI logs.

[github-actions]

Lifecycle test results

78 tests  ±0   78 ✅ ±0   1m 26s ⏱️ -3s
 7 suites ±0    0 💤 ±0 
 7 files   ±0    0 ❌ ±0 

Results for commit 769f735. ± Comparison against base commit d03090c.

[github-actions]

Test results on JDK 8

 71 files  ±0   71 suites  ±0   4m 49s ⏱️ -1s
625 tests ±0  612 ✅ ±0  13 💤 ±0  0 ❌ ±0 
695 runs  ±0  682 ✅ ±0  13 💤 ±0  0 ❌ ±0 

Results for commit 769f735. ± Comparison against base commit d03090c.

[github-actions]

Test results on JDK 19

 71 files  ±0   71 suites  ±0   4m 43s ⏱️ -3s
625 tests ±0  615 ✅ ±0  10 💤 ±0  0 ❌ ±0 
695 runs  ±0  685 ✅ ±0  10 💤 ±0  0 ❌ ±0 

Results for commit 769f735. ± Comparison against base commit d03090c.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.36%. Comparing base (d03090c) to head (769f735).
Report is 1 commits behind head on neo.

Additional details and impacted files

@@            Coverage Diff            @@
##                neo     #302   +/-   ##
=========================================
  Coverage     70.36%   70.36%           
  Complexity     2471     2471           
=========================================
  Files           269      269           
  Lines         15208    15208           
  Branches       2274     2274           
=========================================
  Hits          10701    10701           
  Misses         3577     3577           
  Partials        930      930           

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[github-actions]

Test results on JDK 11

 71 files  ±0   71 suites  ±0   5m 12s ⏱️ +3s
625 tests ±0  617 ✅ ±0  8 💤 ±0  0 ❌ ±0 
695 runs  ±0  687 ✅ ±0  8 💤 ±0  0 ❌ ±0 

Results for commit 769f735. ± Comparison against base commit d03090c.