Apply skip ci filter only on push events

[xoxys]

Fixes: #3606

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 35.98%. Comparing base (8e45ddd) to head (f57bad5).
Report is 3 commits behind head on main.

Files	Patch %	Lines
server/pipeline/create.go	0.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3612      +/-   ##
==========================================
- Coverage   35.98%   35.98%   -0.01%     
==========================================
  Files         231      231              
  Lines       15553    15564      +11     
==========================================
+ Hits         5597     5600       +3     
- Misses       9539     9547       +8     
  Partials      417      417              

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[woodpecker-bot]

Tearing down https://woodpecker-ci-woodpecker-pr-3612.surge.sh