7070385fc4
As discussed on the maintainers mailinglist, and during a maintainers review session; We've recently made changes to the Dockerfile syntax (e.g., `HEALTHCHECK`, `SHELL`), so mentioning the Dockerfile syntax as a frozen feature is no longer accurate. Removing it from frozen features does NOT automatically state an intent to make big changes to the syntax; making changes to the syntax are important decisions and should never be taken lightly. This change is just to indicate that we can *accept* changes if they are meaningful, and we're confident they can be made. Signed-off-by: Sebastiaan van Stijn <github@gone.nl> Upstream-commit: 07250457df03396ea61dbf3782b5f8cf1094e7e0 Component: engine