The vtest binary does not seem to be cached correctly by actions/cache,
the cause of the problem seems to be the binary is installed outside the
github workspace. This patch installs the binary in ~/vtest/ to fix the
issue.
vtest.yml only builds the releases of OpenSSL for now, there's no way to
check if we still have issues with the API before a pre-release version
is released.
This job builds the master branch of OpenSSL.
It is run everyday at 3 AM.
