Generalize explanation of image tag templating

.goreleaser.yml

@@ -16,12 +16,14 @@ snapshot:
   name_template: "{{ .Tag }}-snapshot"
 
 dockers:
-# The `latest` is not touched for pre release.
-# The template string `{{ if .Prerelease }}v{{ .Version }}{{ else }}latest{{ end }}`
-# will compute to `latest` for regular release. For pre releases, it will
-# compute to `v{{ .Version }}`. This duplicates one of the other list items
-# and therefore eliminates `latest` from the list. This is OK to do since
-# `goreleaser` builds the image only once and tagging is a cheap operation.
+# For pre releases, updating `latest` and the floating tags of the major
+# version does not make sense. So only the image for the exact version should
+# be pushed.
+# For the lack of a less verbose solution, go templating is used to set the
+# image tags to the major version or latest for normal releases. For pre
+# releases, all image tags are set to the exact version. This will result in
+# having the same image tag tree times in the list. This is fine to do as the
+# image will be built only once and tagging is a cheap operation.
 - image_templates:
   - "docker.io/vshn/k8up:v{{ .Version }}"
   - "quay.io/vshn/k8up:v{{ .Version }}"