feat: add support for runOnlyForDeploymentPostprocessing

[erisu]

This PR cherry-picked, rebased, and resolved merging conflicts of PR #80.
The forked repository of PR #80 has been since deleted.

This PR also will:

• Closes Support runOnlyForDeploymentPostprocessing #80
• Resolves Add buildPhase option for runOnlyForDeploymentPostprocessing #49

---

Additional Changes:

• Sets runOnlyForDeploymentPostprocessing to 1 with any truthy value, including non-empty strings.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.31%. Comparing base (2f89486) to head (057bcf4).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #172   +/-   ##
=======================================
  Coverage   97.30%   97.31%           
=======================================
  Files          51       51           
  Lines       10928    10940   +12     
=======================================
+ Hits        10634    10646   +12     
  Misses        294      294           

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