Add GitHub Action to Build and Publish Docker Image on Release

[asadarafat]

This PR introduces a GitHub Actions workflow named Build and Push Docker Image that:

• Automatically builds and publishes a Docker image to GitHub Container Registry (GHCR)
• Triggers on new releases (release: published) and also supports manual execution (workflow_dispatch)
• Dynamically generates a Dockerfile based on Red Hat UBI 8 Minimal
• Downloads the official kaf binary using the upstream godownloader script
• Installs useful CLI tools such as jq, yq, tar, zip, and bash
• Runs the image as a non-root admin user to align with container security best practices

The resulting image will be published under:
ghcr.io/<user>/<repo>:<version> and :latest

[birdayz]

we need to do this via goreleaser to stay consistent with the other tooling.