• added alternate images based on alpine:3.13 (e.g. v2.10.0.1-alpine) and amazonlinux:2.0.20211001.0 (e.g. v2.10.0.1-amazonlinux)
• homogenised tagging for docker images to vX.Y.Z, so the tags match the patter we have for up level versions such as
  -- latest (contains the latest stable version release)
  -- v2 (contains the latest v2 version release)
  -- v2.10 (contains the latest v2.10 version release)
  -- v2.10.0.1 (contains the specific version released)
• CI was modified so moving forward, we are able to release alpha and beta versions as pre-releases which will produce docker images, without affecting the latest, v2, nor v2.minor released images.