Create local script to replace existing local dev scripts

[tomkennedy513]

• Support building with pack or ko locally

[sambhav]

Any reason to support both types? Should we just use the one that is better suited here?

[tomkennedy513]

The main reason I added both was a bit of a proof of concept. Inside VMware we have some teams that use ko, but are experimenting with using buildpacks, so I was trying to show a way that you could build the same image with either ko or pack.

Which one has the best developer experience is a bit tough to answer since it depends a bit on what you're doing. Iterating locally, ko will be a bit quicker since there is no docker involved, but it is very dependent on your local environment. Building with pack will replicate our ci so as a developer you can have confidence that the changes you are working on locally will behave the same in ci.

I personally think there is room for both, but if I had to chose one I would pick pack because consistency would be more important to me than speed.

[chenbh]

The trade off is pack is what we use to generate our actual releases (and something-something dog fooding), so you would use it to get as close as possible to the release process/candidate. On the other hand, ko is fast, like 1 min vs 7-10 min. The difference is even greater when both are started from empty caches.

[chenbh]

Whoops, forgot that pack deposits the built binaries at /cnb/process/<app>, which we hard code at

kpack/pkg/apis/build/v1alpha2/build_pod.go

Line 399 in 2646bcf

Command: []string{"/cnb/process/build-init"},

.

[codecov-commenter]

Codecov Report

Merging #1295 (a31a18b) into main (4d30b2a) will not change coverage.
Report is 3 commits behind head on main.
The diff coverage is 95.65%.

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

@@           Coverage Diff           @@
##             main    #1295   +/-   ##
=======================================
  Coverage   67.41%   67.41%           
=======================================
  Files         133      133           
  Lines        8093     8093           
=======================================
  Hits         5456     5456           
  Misses       2200     2200           
  Partials      437      437           

Files	Coverage Δ
pkg/apis/build/v1alpha2/build_pod.go	97.07% <100.00%> (ø)
pkg/blob/fetch.go	58.90% <100.00%> (ø)
pkg/cnb/build_metadata.go	57.89% <100.00%> (ø)
pkg/cnb/env_vars.go	84.00% <100.00%> (ø)
pkg/dockercreds/parse_secrets.go	59.21% <100.00%> (ø)
pkg/registry/fetch.go	49.61% <100.00%> (ø)
pkg/secret/volume_secret_reader.go	67.56% <100.00%> (ø)
pkg/notary/repository.go	0.00% <0.00%> (ø)

implemented requested changes