vendor: update compose to v2.4.1

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

vendor/github.com/compose-spec/compose-go/v2/loader/omitEmpty.go

@@ -0,0 +1,74 @@
+/*
+   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 loader
+
+import "github.com/compose-spec/compose-go/v2/tree"
+
+var omitempty = []tree.Path{
+	"services.*.dns"}
+
+// OmitEmpty removes empty attributes which are irrelevant when unset
+func OmitEmpty(yaml map[string]any) map[string]any {
+	cleaned := omitEmpty(yaml, tree.NewPath())
+	return cleaned.(map[string]any)
+}
+
+func omitEmpty(data any, p tree.Path) any {
+	switch v := data.(type) {
+	case map[string]any:
+		for k, e := range v {
+			if isEmpty(e) && mustOmit(p) {
+				delete(v, k)
+				continue
+			}
+
+			v[k] = omitEmpty(e, p.Next(k))
+		}
+		return v
+	case []any:
+		var c []any
+		for _, e := range v {
+			if isEmpty(e) && mustOmit(p) {
+				continue
+			}
+
+			c = append(c, omitEmpty(e, p.Next("[]")))
+		}
+		return c
+	default:
+		return data
+	}
+}
+
+func mustOmit(p tree.Path) bool {
+	for _, pattern := range omitempty {
+		if p.Matches(pattern) {
+			return true
+		}
+	}
+	return false
+}
+
+func isEmpty(e any) bool {
+	if e == nil {
+		return true
+	}
+	if v, ok := e.(string); ok && v == "" {
+		return true
+	}
+	return false
+}