Add cross platform tests

Since Multibody and dependency seem to be platform dependent, it seems to make sense to test on multiple platforms to avoid e.g. JuliaComputing#159

.github/workflows/CI.yml

@@ -13,16 +13,31 @@ env:
 jobs:
  test:
  name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
- runs-on: ubuntu-latest
+ runs-on: ${{ matrix.os }}
  strategy:
  fail-fast: false
  matrix:
  version:
  - '1'
  os:
  - ubuntu-latest
+ - windows-latest
+ - macOS-13 # intel
+ - macOS-14 # arm
  arch:
  - x64
+ - aarch64
+ exclude:
+ - os: ubuntu-latest
+ arch: aarch64
+ - os: windows-latest
+ arch: aarch64
+ - os: macOS-13 
+ arch: aarch64
+ - os: macOS-14
+ version: 1.6
+ - os: macOS-14
+ arch: x64
  steps:
  - name: Set debug env
  run: export JULIA_DEBUG="loading"