How to access git source directory in a Flatpak manifest?

1

I have this manifest:

id: org.kde.kolorfill
runtime: org.kde.Platform
runtime-version: "5.15-23.08"
sdk: org.kde.Sdk
command: kolorfill
finish-args:
- "--share=ipc"
- "--socket=fallback-x11"
- "--socket=wayland"
rename-icon: logo
modules:
- name: kolorfill
  buildsystem: cmake-ninja
  builddir: true
  config-opts:
  - "-DENABLE_TESTING=OFF"
  - "-DCMAKE_BUILD_TYPE=Release"
  build-commands:
  - install -Dm644 ../logo.png --target-directory=${FLATPAK_DEST}share/icons/hicolor/512x512/apps
  sources:  
  - type: git
    url: https://invent.kde.org/games/kolorfill
    tag: "master"
    commit: "76a0168ece499c6251504d248beeb5d4cfa01a59"

I’m using ../ to refer to the git source file instead of the file in the build directory (using logo.png results in file not found). How can get a reference to the git source directory without using relative links?