This adds F32 manifests in ./test/data/. To avoid magically deducing the
package list out of the void, this adds a ManifestPreProcessor (MPP)
called `./tools/mpp-depsolve.py`. What this does is it takes a manifest
on stdin, modifies it, and produces a manifest on stdout.
The `mpp-depsolve.py` preprocessor takes a manifest and modifies all the
`org.osbuild.rpm` stages. It parses a new option to that stage called
`mpp-depsolve`, which contains a package-list, a repo-list, and dnf
metadata. It then drops this `mpp-depsolve` option (since it would be an
invalid manifest otherwise), depsolves the packages, inserts a proper
"packages" option as well as appends the correct paths to the sources
entry.
With this in place, this adds `mpp-f32-base.json` and
`mpp-f32-build.json` in ./test/data/manifests/. These will then be used
as base F32 manifests for our test-suite.
Lastly, this adds `./test/data/README.md` as a place to document the
files we place in `./test/data/`, since most of the files do not allow
for comments.
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