scylla_repository setup should support scylla-debug in the version format

[bhalevy]

Currently the version format supported by scylla_repository.setup can be either: unstable/<branch>:<build-date> (build-date can be latest as well) or release:<release-number>

And on top of it we use a couple of environment variables to specify some more attributes: SCYLLA_PRODUCT can be scylla or scylla-enterprise (default is scylla) SCYLLA_ARCH can x86_64 or aarch64 (default is x86_64)

But, there is no way to specify scylla-debug vs. scylla for the unified package.

I really don't like the use of the environment variables for the extra attributes. Maybe we should extend the version syntax to allow passing them with the version string, as well as the debug flag.

[bhalevy]

Cc @fruch @cezarmoise

[fruch]

SCYLLA_PRODUCT is not needed anymore, it can assume it from the version use, or from the branch names.

SCYLLA_ARCH is expected to be automatically set, base on the system arch, I don't think it add anything, adding it to the syntax.

debug might be nice addition, as optional extra information:

unstable/<branch>:<build-date>:debug release:<release-number>:debug

[bhalevy]

@fruch please see https://github.com/scylladb/scylla-ccm/pull/591

I think that parsing of the flags better be done as [flags...] instead of another column separated field.

[pehala]

@fruch @bhalevy should we reopen this, since this got yanked?

[fruch]

Yes, it would need to be applied again, and fixed