Custom build steps

[jerbia]

Is there a way to add custom build step(s), especially between the building of an image and pushing it to a registry?

I can think of multiple custom steps that I would love to add:

• Scanning the image for vulnerabilities
• Creating SBOM output
• Sending "slack" notifications
  etc.

I saw another similar request, that was specific to SBOM: #2773
But it requires adding hard-coding the steps into Builkit code, or using custom frontend, which replaced the whole build process and not just adds an extra step.

[tonistiigi]

I'm not sure what you mean exactly in here. Frontends is a component in BuildKit how to include any custom behavior as part of your build and frontends can call other frontends etc. so composition is possible. Inside the frontend you can have as many "build steps" as you want of course.