IceTray docker images for neutrino sources

Supported

Ubuntu 20.04

These images add standard nu-sources tools to icetray images

One versions is created

nu-sources - Add standard nu-sources tools to (skyllh, skylab, csky) to icetray-prod images

Deploying

Uses docker github actions to build per docker/setup-buildx-action

Versions

20.04 nu-sources base images
- icecube/nu-sources:base-current-ubuntu20.04
- icecube/nu-sources:base-current-ubuntu20.04-YYYY-MM-DD