The reason for such a hack when runing in CI is because we
need to make sure we're using higher sequence numbers than
any previous times (and even previous runs of the test suite).
And we run 1 test only for now, later we will enable more.
Other notes:
The trick to extract secrets to files was taken from:
https://stackoverflow.com/a/59482124/544947
The binary-to-text encoding/decoding was taken from:
https://stackoverflow.com/a/42725926/544947
The way to add defines to DefineConstants for MSBuild:
https://stackoverflow.com/a/5053070/544947
Now that we have removed the only VS-specific project [1],
we can make all pipelines of all OSs consistent, building
the solution instead of a specific project.
[1] 90e16c1b1e
