docker: add remote option

[wlynch]

Melange Pull Request Template

Adds an option to push apko bundle images to a remote registry. The intent here is to allow these images to be referenced by non-docker daemon OCI-compliant implementations (e.g. kubernetes pods).

Functional Changes

• [x] This change can build all of Wolfi without errors (describe results in notes)

Notes:

SCA Changes

• [ ] Examining several representative APKs show no regression / the desired effect (details in notes)

Notes:

Linter

• [x] The new check is clean across Wolfi
• [ ] The new check is opt-in or a warning

Notes: