fix(domain): iterate when merging over custom configs

The normal dcmerge did not work, as the check and addition was only
possible if at least one attribute such as service, network or volume
was presentThe normal dcmerge did not work, as the check and addition
was only possible if at least one attribute such as service, network or
volume was present.

The logic was adjusted.

The logic was adjusted.

pkg/domain/dockerCompose/config.go

@@ -66,25 +66,25 @@ func (c *Config) ExistsVolume(name string) bool {
 
 // Merge adds only a missing network, secret, service and volume.
 func (c *Config) Merge(config *Config) {
-	for name, network := range c.Networks {
+	for name, network := range config.Networks {
 		if !c.ExistsNetwork(name) {
 			c.Networks[name] = network
 		}
 	}
 
-	for name, secret := range c.Secrets {
+	for name, secret := range config.Secrets {
 		if !c.ExistsSecret(name) {
 			c.Secrets[name] = secret
 		}
 	}
 
-	for name, service := range c.Services {
+	for name, service := range config.Services {
 		if !c.ExistsService(name) {
 			c.Services[name] = service
 		}
 	}
 
-	for name, volume := range c.Volumes {
+	for name, volume := range config.Volumes {
 		if !c.ExistsVolume(name) {
 			c.Volumes[name] = volume
 		}