This simplifies things for future.

- take a maximum string length to allow usage with blobs
- use "test:" instead of "file://localhost/" for the tests
  which use local file path want it treated as network repository

- pregenerate the needed repository urls
- get rid of apk_url_print and simplify url printing

mkndx --pkgname-spec can now specify how to construct the download
url for related packages.

fetch --pkgname-spec specifies how the downloaded files are named.

This allows repository to use other file extensions and layouts
then what Alpine is currently using.

fixes #10769
fixes #10816

Rosen Penev authored 3 months ago and Timo Teräs committed 3 months ago

Allows disabling tests when not desired.

Signed-off-by: Rosen Penev <rosenp@gmail.com>