Docker Image for linux/arm64

[hundehausen]

I would love to have an image on docker hub for the platform linux/arm64.

[niccokunzmann]

I am building the image for the open-web-calendar for a few different platforms. Would it be appreciated if I create a pull request? The only thing necessary to push the built image automatically is to add the secrets then.

Example GitHub actions build: https://github.com/niccokunzmann/open-web-calendar/blob/master/.github/workflows/docker-image.yml

I am running my server on an ARM64 chip. At the moment, I use peterdavehello/tor-socks-proxy:test. That works for me. I would like to see a steady release to update the latest tag, too.