This package is only available via Git right now, so the install
command needed to be updated.

These don't rely on `ci/templates` and are already used for this
CI configuration elsewhere.

This does not depend on `ci/templates`, but will need to be altered
again slightly once moved to the OSS GitLab.

Semantic Release config relies on packages not currently
available, so they have been replaced.

Plugin previously allowed absolute paths and did not
treat configured paths as being relative to the
contextual `cwd`.
Also now generates archive output path if it doesn't
already exist.