I’m fairly new to microsoft’s/vscode’s devcontainers. I’m setting up a new java dev environment. I’m referencing one of the pre-built versions of Dockerfile: mcr.microsoft.com/devcontainers/java:1-21. Everything works, but I was confused as to what the tag 1-21 meant. According to the docs it has something to do with automatic updates using semantic versioning.

According to the list of available tags, here is a sample of java 21 tags that are available:

1. 1-21
2. 1.1-21
3. 1.1.0-21
4. 1.1.1-21
5. 1.1.9-21

Could someone help explain to me the differences between the various tags?