Add LFS support (#62)

# Add LFS support

## ⚙️ Release Notes 
- Add git LFS support


## 📝 Code of Conduct & Contributing Guidelines 

By submitting creating this pull request, you agree to follow our [Code
of
Conduct](https://github.com/StanfordSpezi/.github/blob/main/CODE_OF_CONDUCT.md)
and [Contributing
Guidelines](https://github.com/StanfordSpezi/.github/blob/main/CONTRIBUTING.md):
- [x] I agree to follow the [Code of
Conduct](https://github.com/StanfordSpezi/.github/blob/main/CODE_OF_CONDUCT.md)
and [Contributing
Guidelines](https://github.com/StanfordSpezi/.github/blob/main/CONTRIBUTING.md).

.github/workflows/xcodebuild-or-fastlane.yml

@@ -115,6 +115,11 @@ on:
         description: "Flag indicating if submodules should be automatically checked out."
         required: false
         type: boolean
+      checkout_lfs:
+        description: "Flag indicating if git lfs should be used when running the check out step."
+        required: false
+        type: boolean
+        default: false
     secrets:
       BUILD_CERTIFICATE_BASE64:
         description: 'The Base64 version of the Apple signing certificate to build your iOS application.'
@@ -167,6 +172,7 @@ jobs:
         # This is GitHubs way of implementing ternary expressions (see https://docs.github.com/en/actions/learn-github-actions/expressions)
         token: ${{ secrets.CHECKOUT_TOKEN != '' && secrets.CHECKOUT_TOKEN || github.token }}
         submodules: ${{ inputs.checkout_submodules }}
+        lfs: ${{ inputs.checkout_lfs }}
     - uses: maxim-lobanov/setup-xcode@v1
       with:
         xcode-version: ${{ inputs.xcodeversion }}