Fix patch YAML without new line on end of file

pkg/yaml/yaml.go

@@ -109,6 +109,13 @@ func AddOrReplace(src []byte, key string, value any, nodeParent *yaml.Node) ([]b
 		i0 := LineOffset(src, nodeKey.Line)
 		i1 := LineOffset(src, LastChild(nodeValue).Line+1)
 
+		if i1 < 0 { // no new line on the end of file
+			if value != nil {
+				return append(src[:i0], put...), nil
+			}
+			return src[:i0], nil
+		}
+
 		dst := make([]byte, 0, len(src)+len(put))
 		dst = append(dst, src[:i0]...)
 		if value != nil {
@@ -121,6 +128,14 @@ func AddOrReplace(src []byte, key string, value any, nodeParent *yaml.Node) ([]b
 
 	i := LineOffset(src, LastChild(nodeParent).Line+1)
 
+	if i < 0 { // no new line on the end of file
+		src = append(src, '\n')
+		if value != nil {
+			src = append(src, put...)
+		}
+		return src, nil
+	}
+
 	dst := make([]byte, 0, len(src)+len(put))
 	dst = append(dst, src[:i]...)
 	if value != nil {