chore: adding version on and tweaking CONTRIBUTING

Signed-off-by: Rafael Brito <rafa@stormforge.io>

CONTRIBUTING.md

@@ -32,6 +32,7 @@ Dependencies:
 1. Docker (with `buildx`)
 2. [just](https://github.com/casey/just) (if you don't want to install it , Just read the `justfile` and run the commands manually)
 3. Multi-arch `buildx` builders set up via https://github.com/tonistiigi/binfmt
+4. `manifest-tool` via https://github.com/estesp/manifest-tool
 4. `npm` (if you want to build the UI)
 
 ### Build the backend

justfile

@@ -1,6 +1,6 @@
 commonenv := "CGO_ENABLED=0"
 
-version := "dev"
+version := `./tools/image-tag`
 commit := `git rev-parse --short HEAD`
 
 default: