Scripts to run Pharo Launcher aren't executable by default

[Bajger]

Describe the bug
Scripts to run Pharo Launcher aren't executable by default: pharo-launcher and pharo-launcher-ui

To Reproduce
Steps to reproduce the behavior:

1. Go to directory with deployed launcher package.
2. Execute e.g.: ./pharo-launcher help
3. See error: bash: ./pharo-launcher: Permission denied
4. Same for pharo-launcher-ui

Expected behavior
Both executable scripts should be set to be executable by default.

Screenshots
If applicable, add screenshots to help explain your problem.

Version information:

• OS: Linux/Ubuntu
• Version: Pre-release: https://github.com/pharo-project/pharo-launcher/actions/runs/7501196046

Expected development cost
Add chmodto set executable flag on both scripts.

[demarey]

After a fresh git clone, both scripts have execution permissions.
It looks loke github artifact archive loose these permissions: actions/upload-artifact#38