Dj Walker-Morgan has announced that Deno, a secure runtime for JavaScript and TypeScript, has reached version 1.0. The author explains how to deploy Deno applications onto Fly, allowing them to run closer to users. They discuss the benefits of using a Dockerfile for deployment, which provides complete control over packaging and can lead to smaller image files and better build time performance compared to using a buildpack. The article then walks through building and deploying Deno with a Dockerfile, including creating a Dockerfile, exposing ports, copying dependencies, running the application, and testing locally. Finally, it demonstrates how to deploy the application to Fly using flyctl init and flyctl deploy commands.