Use buildpackless builder for samples that need to append additional buildpacks

[dmikusa]

The latest failures of the all samples build are all because the builds hit the layer limit. The three failing apps end with:

embedded daemon response: max depth exceeded

For less flaky tests, we need to switch any of the sample apps that require appending additional buildpacks (i.e. use the -b flag) to use the buildpackless builder so they don't hit layer limits.