Cannot build multiplatform image with Jib

[gsquared94]

In the examples/jib project, run:

skaffold build --platform=linux/amd64,linux/arm64 --default-repo=<your-repository>

Expected behavior

Since the configured base image doesn't support linux/arm64 the build fails and Skaffold reports the appropriate actionable error asking the user to use an appropriate base image.

Actual behavior

The specified base image gcr.io/google-appengine/openjdk:8 is not a manifestlist. The builds shows a warning and only builds a single platform image.

[INFO] Using base image with digest: sha256:c12812974ad966167f5ec267f0ef663ed1b5d315baad4c658a0da875f1b46f4e
[WARNING] platforms configured, but 'gcr.io/google-appengine/openjdk:8' is not a manifest list
[INFO] 
[INFO] Container entrypoint set to [java, -Djava.security.egd=file:/dev/./urandom, -cp, /app/resources:/app/classes:/app/libs/*, hello.Application]
[INFO] 
[INFO] Built and pushed image as gsquared94/skaffold-jib:v1.39.1-1-g0531dfa43-dirty

Information

Skaffold should check the provided base image for matching target platforms and error early if not found.

[gsquared94]

Opened GoogleContainerTools/jib#3707

[gsquared94]

this is now fixed.