fix(automate): make sure we exit with code 0 if execution completes

[gjedlicska]

Description & motivation

Changes:

To-do before merge:

Screenshots:

Validation of changes:

Checklist:

• My pull request follows the guidelines in the Contributing guide?
• My pull request does not duplicate any other open Pull Requests for the same update/change?
• My commits are related to the pull request and do not amend unrelated code or documentation.
• My code follows a similar style to existing code.
• I have added appropriate tests.
• I have updated or added relevant documentation.

References

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 87.58%. Comparing base (204aa74) to head (239bc4b).

Files	Patch %	Lines
src/speckle_automate/runner.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #338      +/-   ##
==========================================
+ Coverage   87.56%   87.58%   +0.01%     
==========================================
  Files          95       95              
  Lines        5647     5646       -1     
==========================================
  Hits         4945     4945              
+ Misses        702      701       -1     

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