Publish USB image only when a release is tagged

[volkertb]

@crazii What if I change it so that it will still always build, but only publish when you push a tag?

So only once you're ready to actually "release a new version", you do the following (assuming for example that you want to release a version numbered 1.4):

git tag -a v1.4 -m "Release version 1.4 of SBEMU"
git push origin v1.4

And then GitHub Actions will not only build as usual, but also package and publish the USB image.

Would that work for you?

Originally posted by @volkertb in #70 (comment)