Minimize Docker image, publish to GitHub Container Registry #422
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This is a rewrite of the Dockerfile to use a multi-stage build, which constructs a final Docker image that doesn't contain the massive opam, OCaml compiler and build dependencies.
Also adds a workflow for automatically building and publishing it on GitHub Container Registry instead of DockerHub: https://github.com/goblint/analyzer/pkgs/container/analyzer.
There is now a GitHub Action for Goblint, which uses the minimized Docker image: https://github.com/goblint/action.
Here's a repository where I tested that it works: https://github.com/sim642/goblint-action-test.
Currently it's not too useful since it just outputs warnings to the terminal, but after #376 it should integrate even better, while not requiring Goblint to be compiled each time and weird path hacks.