git: openjdk/shenandoah-visualizer: master: Basic pre-integration tests

[duke]

Changeset: 24509d1d
Author:    Aleksey Shipilev <shade at redhat.com>
Date:      2020-11-16 19:37:20 +0000
URL:       https://github.com/openjdk/shenandoah-visualizer/commit/24509d1d

Basic pre-integration tests

+ .github/workflows/pre-integration.yml