Add GH workflow to automatically build and deploy Docker images + multiarch support (amd64/arm6/arm64)

[gpailler]

The primary goal of my changes was to build a Docker image for arm6 (Raspberry pi)

About the changes:

• I have added python3-dev and cargodependencies in the DockerFile as required by https://cryptography.io/en/latest/installation.html#alpine
• I also have updated the Dockerfile to a multi-stage build to keep the images as small as possible
• I have added a docker_image.yml workflow to build and push the amd64/arm6/arm64 images automatically
  • You need to add 2 secrets in your project settings:
  • DOCKER_HUB_USERNAME = your Docker Hub username
  • DOCKER_HUB_ACCESS_TOKEN = your Docker Hub token
  • In Actions, you can then run the Docker image workflow (the first build takes ~20 minutes but intermediate layers are cached so the subsequent builds are faster)

The GH workflow is running fine on my GitHub project and the images are properly pushed to my Docker repository. I have tested the arm6 image on a RPi 2 and it's running fine.

Thanks for your project!

[pajikos]

Hi @gpailler thank you, nice work.

[gpailler]

Awesome! Thanks!