env: use foo= instead of foo="" for empty variables

to improve readability

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

pkg/cluster/env.go

@@ -117,8 +117,12 @@ func (m *Env) writeEnvVar(w io.Writer, value string, name string, args ...any) {
 	if name != "" {
 		value = strings.TrimSpace(value)
 
+		if value == "" {
+			_, _ = fmt.Fprintf(w, "%s%s=\n", prefix, name)
+		} else {
 			_, _ = fmt.Fprintf(w, "%s%s=%q\n", prefix, name, value)
 		}
+	}
 }
 
 func genEnvZoneNodes(z *Zone) string {