vendor: update compose-go to v1.20.0

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

vendor/github.com/compose-spec/compose-go/loader/mapstructure.go

@@ -0,0 +1,53 @@
+/*
+   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 "reflect"
+
+// comparable to yaml.Unmarshaler, decoder allow a type to define it's own custom logic to convert value
+// see https://github.com/mitchellh/mapstructure/pull/294
+type decoder interface {
+	DecodeMapstructure(interface{}) error
+}
+
+// see https://github.com/mitchellh/mapstructure/issues/115#issuecomment-735287466
+// adapted to support types derived from built-in types, as DecodeMapstructure would not be able to mutate internal
+// value, so need to invoke DecodeMapstructure defined by pointer to type
+func decoderHook(from reflect.Value, to reflect.Value) (interface{}, error) {
+	// If the destination implements the decoder interface
+	u, ok := to.Interface().(decoder)
+	if !ok {
+		// for non-struct types we need to invoke func (*type) DecodeMapstructure()
+		if to.CanAddr() {
+			pto := to.Addr()
+			u, ok = pto.Interface().(decoder)
+		}
+		if !ok {
+			return from.Interface(), nil
+		}
+	}
+	// If it is nil and a pointer, create and assign the target value first
+	if to.Type().Kind() == reflect.Ptr && to.IsNil() {
+		to.Set(reflect.New(to.Type().Elem()))
+		u = to.Interface().(decoder)
+	}
+	// Call the custom DecodeMapstructure method
+	if err := u.DecodeMapstructure(from.Interface()); err != nil {
+		return to.Interface(), err
+	}
+	return to.Interface(), nil
+}