chore: disable artifact sign for local builds

[amagyar-iohk]

Description:

Removes the sign when publishing to maven local

Checklist:

• My PR follows the contribution guidelines of this project
• My PR is free of third-party dependencies that don't comply with the Allowlist
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have checked the PR title to follow the conventional commit specification

[github-actions]

Unit Test Results

150 tests  ±0   147 ✅ ±0   7s ⏱️ ±0s
 26 suites ±0     3 💤 ±0 
 26 files   ±0     0 ❌ ±0 

Results for commit 7ee301e. ± Comparison against base commit 576d0de.