Base docker images for Ubuntus

Supported

Ubuntu 20.04
Ubuntu 22.04

These packages are not tied to a particular icetray version, but serve as a development and deployable base for other software to be added to.

Two flavors are created:

devel - includes all tools and libraries needed to compile icetray and tools
prod - includes only libraries needed at runtime in deployment situations

Deploying

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

Versions

20.04 includes devel tagged as:
- icecube/icetray-base:devel-ubuntu20.04
- icecube/icetray-base:devel-ubuntu20.04-YYYY-MM-DD
20.04 includes prod tagged as:
- icecube/icetray-base:prod-ubuntu20.04
- icecube/icetray-base:prod-ubuntu20.04-YYYY-MM-DD
22.04 includes devel tagged as:
- icecube/icetray-base:devel-ubuntu22.04
- icecube/icetray-base:devel-ubuntu22.04-YYYY-MM-DD
22.04 includes base tagged as:
- icecube/icetray-base:prod-ubuntu22.04
- icecube/icetray-base:prod-ubuntu22.04-YYYY-MM-DD