i can't get the command to work when loading from appveyor.yml file.
what am i doing wrong?

```
for:
  -
    matrix:
      only:
        - configuration: Release
          job_name: Tests A
    platform: Any CPU # this setting is ignored
    test_script:
      - ps: >-
          $powershell7 = 'C:\Program Files\PowerShell\7\pwsh.exe'
          $command = 'C:\projects\appveyor_scripts\TestA.ps1'
          & $powershell7 -file $command
  -
    matrix:
      only:
        - configuration: Release
          job_name: Tests B
    platform: Any CPU # this setting is ignored
    test_script:
      - ps: >-
          $powershell7 = 'C:\Program Files\PowerShell\7\pwsh.exe'
          $command = 'C:\projects\appveyor_scripts\TestB.ps1'
          & $powershell7 -file $command

  -
    matrix:
      only:
        - configuration: Release
          job_name: Tests C
    platform: Any CPU # this setting is ignored
    test_script:
      - ps: >-
          $powershell7 = 'C:\Program Files\PowerShell\7\pwsh.exe'
          $command = 'C:\projects\appveyor_scripts\TestC.ps1'
          & $powershell7 -file $command
```

I am getting this error.

```
$powershell7 = 'C:\Program Files\PowerShell\7\pwsh.exe' $command = 'C:\projects\appveyor_scripts\TestA.ps1' & $powershell7 -file $command
At line:1 char:57
+ ... wershell7 = 'C:\Program Files\PowerShell\7\pwsh.exe' $command = 'C:\p ...
+ ~~~~~~~~
Unexpected token '$command' in expression or statement.
At line:1 char:109
+ ... sh.exe' $command = 'C:\projects\appveyor_scripts\TestA.ps1' & $powers ...
+ ~
Unexpected token '&' in expression or statement.
```