add --with-env flag to publish command

this flag allow publishing env variables in the Compose OCI artifact

Signed-off-by: Guillaume Lours <705411+glours@users.noreply.github.com>

pkg/api/api.go

@@ -422,6 +422,7 @@ const (
 // PublishOptions group options of the Publish API
 type PublishOptions struct {
 	ResolveImageDigests bool
+	WithEnvironment     bool
 
 	OCIVersion OCIVersion
 }