zones: adds ForEachMachine() iterator

Signed-off-by: Alejandro Mery <amery@jpi.io>

pkg/zones/zones.go

@@ -31,6 +31,15 @@ type Zones struct {
 	Zones []*Zone `toml:"zones"`
 }
 
+// ForEachMachine calls a function for each Machine in the cluster
+func (m *Zones) ForEachMachine(fn func(*Machine)) {
+	for _, z := range m.Zones {
+		for _, p := range z.Machines {
+			fn(p)
+		}
+	}
+}
+
 // NewFS builds a [Zones] tree using the given directory
 func NewFS(dir fs.FS, domain string) (*Zones, error) {
 	z := &Zones{