make "wrench script rebuild" install Go first

Signed-off-by: Stephen Gutekanst <[email protected]>

internal/wrench/scripts/rebuild.go

@@ -0,0 +1,15 @@
+package scripts
+
+func init() {
+	Scripts = append(Scripts, Script{
+		Command:     "rebuild",
+		Args:        nil,
+		Description: "wrench rebuilds and reinstalls itself, installing prerequisites (Go) if needed",
+		Execute: func(args ...string) error {
+			return Sequence(
+				Exec("wrench script install-go"),
+				Exec("wrench script rebuild"),
+			)()
+		},
+	})
+}