fix(docker): provide workaround to save network name variable (#6080)

* fix/EE-1862/unable-to-stop-or-remove-stack workaround for var without default value in yaml file

* fix/EE-1862/unable-to-stop-or-remove-stack check yaml file

* fixed func and var names

* wrapper error and used bool for stringset

* UT case for createNetworkEnvFile

* UT case for %s=%s

* powerful StringSet

* wrapper error for extract network name

* wrapper all the return err

* store more env

* put to env file

* make default value None

api/exec/common.go

@@ -2,4 +2,49 @@ package exec
 
 import "regexp"
 
-var stackNameNormalizeRegex = regexp.MustCompile("[^-_a-z0-9]+")
+var stackNameNormalizeRegex = regexp.MustCompile("[^-_a-z0-9]+")
+
+type StringSet map[string]bool
+
+func NewStringSet() StringSet {
+	return make(StringSet)
+}
+
+func (s StringSet) Add(x string) {
+	s[x] = true
+}
+
+func (s StringSet) Remove(x string) {
+	if s.Contains(x) {
+		delete(s, x)
+	}
+}
+
+func (s StringSet) Contains(x string) bool {
+	_, ok := s[x]
+	return ok
+}
+
+func (s StringSet) Len() int {
+	return len(s)
+}
+
+func (s StringSet) List() []string {
+	list := make([]string, s.Len())
+
+	i := 0
+	for k, _ := range s {
+		list[i] = k
+		i++
+	}
+
+	return list
+}
+
+func (s StringSet) Union(x StringSet) {
+	if x.Len() != 0 {
+		for k := range x {
+			s.Add(k)
+		}
+	}
+}