Move stringutils upstream

Signed-off-by: Laura Brehm <laurabrehm@hey.com>

utils/stringutils.go

@@ -0,0 +1,38 @@
+/*
+   Copyright 2020 The Compose Specification Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package utils
+
+import (
+	"strconv"
+	"strings"
+)
+
+// StringContains check if an array contains a specific value
+func StringContains(array []string, needle string) bool {
+	for _, val := range array {
+		if val == needle {
+			return true
+		}
+	}
+	return false
+}
+
+// StringToBool converts a string to a boolean ignoring errors
+func StringToBool(s string) bool {
+	b, _ := strconv.ParseBool(strings.ToLower(strings.TrimSpace(s)))
+	return b
+}