Reports generation used to be executed four times. The number of runs
was a result of cartesian product of two sets - old and new state, and
of amd64 and arm64 architectures. It was pretty much a slow process
because egencache was called implicitly four times, and it was running
in a single-threaded fashion, and also SDK reports were duplicated
(they were the same for old-amd64 and old-arm64, and the same for
new-amd64 and new-arm64 runs).
This changes the generation, so it is being run only two times - once
for old state and once for new state. Every run generates SDK packages
reports and per-architecture board packages reports. Egencache will
now utilize more threads too.
This adds an explicit generation of md5-metadata cache before any we
do any emerge invocations. That way we can have a copy of reports even
if emerge fails for some reason. But mostly the reason for this
copying is to consume the data later, outside the SDK container.
This adds some scripts I have been using for over a year to deal with
the weekly package updates.
It comes with a `README.md` which describes a workflow similar to my
own.
The `sync_packages.sh` and `update_packages.sh` scripts are currently
not used anywhere. The idea behind them was to use them for Github
Action, but that will come as a follow-up PR.
