-Calls docker-get-git-describe.sh or docker-get-yaml-tag.sh (depending on the
-'docker-use-params-from' condition) to obtain the tag to build.
+Chooses a container tag to label the image based on the 'container-tag-method'
+parameter. If container-tag-method: latest, the tag 'latest' is used.
+If container-tag-method: git-describe, the tag is obtained using
+the git describe command, which requires that the repository has a git tag.
+If container-tag-method: yaml-file, the tag is obtained using
+the yq command, which requires that the repository has a YAML file named
+'container-tag.yaml'. The script checks the docker-root directory by
+default or the directory specified by parameter container-tag-yaml-dir.
+An example file appears below.
+