Failure to detect Ruby app from the Buildpacks sample directory

[pmbanugo]

What happened?

I tried to build a ruby app with the base (paketobuildpacks/builder:base) and full (paketobuildpacks/builder:full) builder but they couldn't detect the app, and thus nothing was built. I'm using the sample app in the buildpacks sample repo. However, when I switch to Heroku buildpacks or the CNB ones, it was able to detect and build the app.

• What were you attempting to do?

Build a Ruby app

• What did you expect to happen?

Detect the app and package it.

• What was the actual behavior? Please provide log output, if possible.

===> DETECTING
ERROR: No buildpack groups passed detection.
ERROR: Please check that you are running against the correct path.
ERROR: failed to detect: no buildpacks participating

Build Configuration

• What platform (pack, kpack, tekton buildpacks plugin, etc.) are you using? Please include a version.

Tekton

• What buildpacks are you using? Please include versions.

• What builder are you using? If custom, can you provide the output from pack inspect-builder <builder>?

paketobuildpacks/builder:base and paketobuildpacks/builder:full

• Can you provide a sample app or relevant configuration (buildpack.yml, nginx.conf, etc.)?

https://github.com/buildpacks/samples/tree/main/apps/ruby-bundler