用密钥解析Yaml提供错误

I’ve the following yaml which I need to parse, I’ve tried with the following

Build-t:
  before: test1
    - value : dddd 
       -  bbb: zzzz

  after: test2
     - value: bbb
        - aaa: aaaa

I’ve tried with the following:

type root struct{
 build type Build `yaml:"Build-t,omitempty"`
} 


type Build struct {
    Before map[string]interface{} `yaml:"before,omitempty"`
    After map[string]interface{} `yaml:"after,omitempty"`
 }

Now when I parse it I got error,

What I need is to get the values from the object before and after which are hardcoded value in the yaml And all the others value under it are dynmically can be added therefor I put it as interface

btw, if I change the root to this its working and I see all the fields under the Build-t but the before and after are like keys ...

type root struct{
 build type map[string]interface{} `yaml:"Build-t,omitempty"`
} 

the error is:

line 6: cannot unmarshal !!str `test1` into map[string]interface {}
        line 7: cannot unmarshal !!str `test2` into map[string]interface {}

see the yaml valid here https://codebeautify.org/yaml-validator/cb705458

That sounds correct - the YAML is invalid. Did you mean something like this?

Build-t:
 before:
   test1:
     - value: dddd
     - bbb: zzzz

 after:
   test2:
     - value: bbb
     - aaa: aaaa

Remember that the whitespace is important, and it's a key-value structure - so your values can either be strings, or substructures - not both.

Also, that yaml validator... I can't seem to make it declare anything as invalid!