Build & push docker images on GitHub Actions
Build & push docker images on GitHub Actions

The Docker Hub recently stopped auto builds for free plan.
We need to build and push docker images as a part of release process.

Breaking Changes: The `latest` tag now points at the latest release.
Previously the `latest` tag pointed at the master branch, if you want to
use the master branch, use the `master` tag instead.

minamijoyo/myaws