How to create a package only containing files (i.e. no binaries etc.) using the fetch pipeline?

[kastl-ars]

Dear all,

as apko still does not allow adding files, I tried out the suggestion to package the files and add the package to the image.

A prototype is here: https://github.com/kastl-ars/apko-pluto-with-files-via-apk

Unfortunately it looks like downloading a plain file (i.e. not an archive) is not working.

pipeline:

  - uses: fetch
    with:
      uri: https://raw.githubusercontent.com/kastl-ars/apko-pluto-with-files-via-apk/refs/heads/main/files/hello-world.txt
      expected-sha256: 03ba204e50d126e4674c005e04d82e84c21366780af1f43bd54a37816b6ab340
      extract: false
      directory: /etc/

The package builds, but the image does not contain any traces of the file.

I tar'ed up the file and fetched the tar.gz file, but also, no trace of the file:

pipeline:

  - uses: fetch
    with:
      uri: https://raw.githubusercontent.com/kastl-ars/apko-pluto-with-files-via-apk/refs/heads/main/files/hello-world.tar.gz
      expected-sha256: dfd15f6cf344fe0db3b9a8b50266ea222f997cb8ffaa58e39f309d7c531088cc
      extract: true
      directory: /etc/

Unfortunately, the fetch pipeline seems to be the only pipeline that could achieve adding plain files. Or did I miss a fitting candidate in the list of pipelines?

How would I get this working? Or am I making an error in another part of the process?

Kind Regards,
Johannes