Release v1.0.0

release.yml: Set up Continuous Deployment

This commit sets up CD workflow that automatically
handles release steps. Whenver a commit is tagged
with v1.x.x, a release will be triggered. Specifically,
a release workflow includes the following steps:

1. Tag the commit to be released. This is the only
step done by the developer.
2. Build a container image.
3. Publish the container image to Docker Hub.
4. Create a GitHub release.
5. Create a Pull Request to bump the project version
in maven.