fix get secret none

[zhy76]

Describe what this PR does / why we need it

fix get secret none because pull_request event can't get github SECERT, this will cause sealer login failed.

Does this pull request fix one issue?

Describe how you did it

Describe how to verify it

Special notes for reviews

[codecov-commenter]

Codecov Report

Patch coverage: 50.00% and no project coverage change.

Comparison is base (9bb277b) 18.87% compared to head (f91ed06) 18.88%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2122   +/-   ##
=======================================
  Coverage   18.87%   18.88%           
=======================================
  Files          95       95           
  Lines        8899     8906    +7     
=======================================
+ Hits         1680     1682    +2     
- Misses       6991     6994    +3     
- Partials      228      230    +2     

Flag	Coverage Δ
unit-tests	18.88% <50.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/application/v2app.go	29.31% <44.44%> (-0.03%)	⬇️
cmd/sealer/cmd/utils/application.go	60.00% <100.00%> (ø)

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[kakaZhou719]

LGTM