Production builds in Fedora have a couple extra features:
* ISOs have custom overrides to set the correct volume/app IDs
* Image filenames are structured to follow roughly NVRA format
Now we support these features with extra helper scripts. If a
"image release" value is passed in, then we fully mimic the
production image build process.
This will be particularly useful for making respins of Fedora images
with updates applied.
(cherry picked from commit 2c5cf67014f3c755c2f1b42794f804388a64e35c)
In preparation for having multiple top-level kiwi description files,
expose the ability to define which file to read.
Additionally, tests are updated to use this new flag.
Once the image build is done, we do not need the working tree
anymore and leaving it around causes it to get archived at the
end of CI runs when it is totally unneeded.
