How to run command "source etc/bashrc" in simple buildsystem?

Hi,

I am trying to build OpenFOAM. https://www.openfoam.com/
The install instruction told to source the given bashrc using source etc/bashrc which I try below.
OpenFOAM Repo: 3. Setting the Environment | OpenFOAM

However, in the env command, the environment variable does not show any specific OpenFOAM variable, which I guess that it does not work.

I would like some suggestion. Thank you.

app-id: com.openfoam.OpenFOAM
runtime: org.freedesktop.Sdk
sdk: org.freedesktop.Sdk
runtime-version: 22.08
command: openfoam
finish-args:
  - --share=ipc
  - --device=dri

modules:
  - name: openmpi
    cleanup:
      - /bin
    sources:
      - type: archive
        url: https://download.open-mpi.org/release/open-mpi/v4.1/openmpi-4.1.4.tar.bz2
        sha256: 92912e175fd1234368c8730c03f4996fe5942e7479bb1d10059405e7f2b3930d

  - name: OpenFOAM
    buildsystem: simple
    build-commands:
      - source etc/bashrc
      - env
      - ./Allwmake
    sources:
      - type: archive
        url: https://dl.openfoam.com/source/v2212/OpenFOAM-v2212.tgz
        sha256: 0a3ddbfea9abca04c3a811e72fcbb184c6b1f92c295461e63b231f1a97e96476

try source etc/bashrc && ./Allwmake