I am working with taskctl to simplify some builds and to use PowerShell as my context for the task. I have sucessfully created a context that allows me to do this.

From the docs, I had thought that I would be able to set some variables in the context and then use them in the task which uses that context, like so:

contexts:
  powershell:
    executable:
      bin: pwsh
      args:
        - -NoProfile
        - -Command
    variables:
      test_arguments: "-v q /p:CollectCoverage=true /p:CoverletOutputFormat=opencover"

tasks:

  test:unittest:
    context: powershell
    description: Perform unit tests
    command:
      - build/scripts/Invoke-DotNetTests.ps1 -arguments {{ .test_arguments }}
    env:
      pattern: "*UnitTests"

However, when I run this i get the error message:

time="2021-11-12 14:59:45" level=info msg="Running task test:unittest..."
time="2021-11-12 14:59:45" level=info msg="test:unittest finished. Duration 498.7µs"
time="2021-11-12 14:59:45" level=fatal msg="task test:unittest failed: template: interpolate:1:76: executing \"interpolate\" at <.test_arguments>: map has no entry for key \"test_arguments\""

Does this mean it is not possible to interpolate variables set in the context?