For discussion: stop building base image for SLC6
Building a base image for SLC5 broke quite some time ago and SLC6 is getting more and more difficult. I would suggest we do the following:
- define a legacy base image for SLC5 and archive it somewhere, e.g. on open data portal (and also double check that we have it in the registry here and on Docker Hub)
- define a legacy base image for SLC6 and archive it somewhere, e.g. on open data portal (and also double check that we have it in the registry here and on Docker Hub)
This refers to the images that do not have a CMSSW release installed. In the future, install a minimal set of updated packages if needed, but start from those images.
I don't think there's a point trying to exercise the building of those really old distributions, it only adds to our maintenance load.