we are using tart for running gitlab-ci pipelines (great project btw, it's really the thing i've been looking for)

now, a couple of our pipelines have code like this:

FLAGS="--foo --bar"
./somecmd ${FLAGS}

under bash (which used to be the default shell for all our cross-platform pipelines until now) this will run ./somecmd --foo --bar.

however, the tart executor defaults to using zsh, which does not do word-splitting for non-quoted variables, and the command excuted is effectively ./somecmd "--foo --bar", which of course is something completely different.

now seeing that there is a TART_EXECUTOR_SHELL variable that i can set to bash, i figured that this would solve my problems...
only to discover, that the bash-environment significantly differs from the default environment.

for me the difference is most prominently the lack of the brew, which stems from paths not being initialized.

so here's a test-pipeline to examine the current behaviour

sonoma:
  tags:
    - tart
  image: ghcr.io/cirruslabs/macos-sonoma-xcode:latest
  script:
    - echo $PATH
    - which brew

sonoma-matrix:
  extends: sonoma
  parallel:
    matrix:
      - TART_EXECUTOR_SHELL:
        - bash
        - zsh

which gives me one successful job (where TART_EXECUTOR_SHELL is unset) and two failing ones (where it is set):

is this expected behaviour?