Retrieve vagrant and ruby-libvirt dependencies and modify as needed to
allow testing against ruby 3.0 until released versions support.
Use conditionals to skip steps when not needed.
Note that in order to use the locally built gem added to the cache
manually, need to disable checksums. However as all other ruby
versions will continue to use it, shouldn't be an issue as long as the
cache for ruby 3.0.0 is wiped clean before being used for anything such
as publishing.
Fixes: #1244
It appears that the suggestion that flag-name should be set when doing
parallel builds, appears to lead to incorrect reporting by coveralls of
the overall coverage of all runs combined back onto the PR.
Migrate to github actions as travis has switched to a process that will
require requesting minutes regularly for open source projects, and
current development is slow enough that this additional overhead is too
much.
Correct the generation of the line coverage following the example at
coverallsapp/github-action#29. Remove dependency on coveralls
gem as no longer needed if using the action.
Patch older versions of simplecov to contain a branch_coverage?
method to ensure working with simplecov-lcov.
