enhance(flags): add compressed caching, log timestamp, and ignore path flags

[ecrupper]

Adding a few seemingly useful flags for the Kaniko executor:

• https://github.com/GoogleContainerTools/kaniko#flag---compressed-caching

• https://github.com/GoogleContainerTools/kaniko#flag---log-timestamp

• https://github.com/GoogleContainerTools/kaniko#flag---ignore-path

[codecov]

Codecov Report

Attention: Patch coverage is 13.51351% with 32 lines in your changes missing coverage. Please review.

Project coverage is 32.76%. Comparing base (6645c4a) to head (79d1366).
Report is 1 commits behind head on main.

Files	Patch %	Lines
cmd/vela-kaniko/main.go	0.00%	30 Missing ⚠️
cmd/vela-kaniko/plugin.go	71.42%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #197      +/-   ##
==========================================
- Coverage   33.57%   32.76%   -0.81%     
==========================================
  Files           8        8              
  Lines         557      586      +29     
==========================================
+ Hits          187      192       +5     
- Misses        370      393      +23     
- Partials        0        1       +1     

Files	Coverage Δ
cmd/vela-kaniko/build.go	100.00% <ø> (ø)
cmd/vela-kaniko/repo.go	100.00% <ø> (ø)
cmd/vela-kaniko/plugin.go	92.94% <71.42%> (-1.94%)	⬇️
cmd/vela-kaniko/main.go	0.00% <0.00%> (ø)

[plyr4]

sweet