Previously immutable tagged images were separately built as a pseudo- flavor, with the actual build-time flavor being reset to 'stable'. This is overly complex and unnecessary since the 'stable' flavor build may simply be reused. Alter the build and tagging automation to handle the -immutable tags automatically for every 'stable' flavor image. In other words, any necessary -immutable tags will simply be added by tag_version.sh when operating on the 'stable' flavor images.
Previously immutable tagged images were separately built as a pseudo- flavor, with the actual build-time flavor being reset to 'stable'. This is overly complex and unnecessary since the 'stable' flavor build may simply be reused. Alter the build and tagging automation to handle the
-immutabletags automatically for every 'stable' flavor image. In other words, any necessary-immutabletags will simply be added bytag_version.shwhen operating on the 'stable' flavor images.Minor: Also update immutable image docs.