Multi repositories in Variables

Hello i have multi repositories:

code: the source code of application android

tool: pipeline.yml

In pipeline.yml i wrote below, so i have variables $branch which contain branch the code

variables:
    branch: $[ resources.repositories['code'].ref ]

How i can use if else variables refer to $branch variables, i have try like this and not working

jobs:
- job: 
  variables:
    ${{ if eq(variables.branch, 'master') }}:
      AssembleTask: assembleProdRelease
    ${{ elseif eq(variables.branch, 'release') }}:
      AssembleTask: assembleProdRelease
    ${{ elseif eq(variables.branch, 'develop') }}:
      AssembleTask: assembleSitDebug

I run the pipeline refer to "tool" repository.