Configure Docker build+publish via GH Actions

[MPParsley]

The latest docker image on docker hub is a year old. Would be nice to push a new image.

[rubensworks]

Dockerhub is configured to auto-build on this repo, so something must be broken...

[rubensworks]

Ah, apparently automated builds require a paid subscription now :/
So I guess we'll have to configure a GH Actions build process instead.

[rubensworks]

Pushed a manual build in the meantime.

[MPParsley]

Thanks!

[MPParsley]

I'm not seeing any user statements in https://hub.docker.com/layers/comunica/jquery-widget.js/latest/images/sha256-3920f8c348a2f67a27cd9c671dd99e88fd53b92f25fb6fa4c53dc8685b3dc977?context=explore

It prevents us from using it in OpenShift:

Image comunica/jquery-widget.js:latest runs as the root user which might not be permitted by your cluster administrator.

How did you publish the image?

[rubensworks]

Looks like I did something wrong, can you try again?

[MPParsley]

Perfect, tyvm!

[rubensworks]

Let's leave this issue open, as we still want auto-builds.

[MPParsley]

Of course!