ci: conditionally trigger GitHub Actions when needed

[sudiptob2]

Fixes #897

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[codecov]

Codecov Report

Merging #898 (d7cf182) into main (2fa1a02) will increase coverage by 0.01%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #898      +/-   ##
==========================================
+ Coverage   58.59%   58.60%   +0.01%     
==========================================
  Files          97       97              
  Lines        7552     7552              
==========================================
+ Hits         4425     4426       +1     
+ Misses       2936     2935       -1     
  Partials      191      191              

Impacted Files	Coverage Δ
...ator/controllers/lifecycle/keptntask/controller.go	54.94% <0.00%> (-3.30%)	⬇️
...lers/lifecycle/keptnworkloadinstance/controller.go	82.95% <0.00%> (+1.79%)	⬆️

Flag	Coverage Δ
component-tests	42.20% <ø> (+0.54%)	⬆️
keptn-lifecycle-operator	54.67% <ø> (ø)
klt-cert-manager	67.50% <ø> (ø)
scheduler	21.17% <ø> (ø)

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[aepfli]

lgtm

[mowies]

thanks @sudiptob2 , will merge now