How to set job.env use variables that have been defined in job.env . thanks

[shinhwagk]

```yml
jobs:
  step1:
    runs-on: ubuntu-latest
    env:
  var1: hello
  var2: "${var1}_world"
```

[adamrushuk]

That is not supported right now, I asked a similar question, but there was a solution: https://github.community/t5/GitHub-Actions/How-can-we-concatenate-multiple-env-vars-at-workflow-and-job/m-p/48521#M7203