Dirk Hohndel ef3d67be08 GitHub Actions: add Linux Qt 5.12 container build
The AppImage works - I just need to figure out how to post releases. For now
it'a available on the Actions page as Artifact.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
2019-10-16 10:57:32 -07:00
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