add lfs input to enable checkout with Git LFS support

Author: tmacro

.github/workflows/docker-build.yaml

@@ -37,6 +37,10 @@ on:
       build-args:
         required: false
         type: string
+      lfs:
+        required: false
+        type: boolean
+        default: false
     secrets:
       REGISTRY_LOGIN:
         required: false
@@ -53,6 +57,8 @@ jobs:
     steps:
     - name: Checkout
       uses: actions/checkout@v2
+      with:
+        lfs: ${{ inputs.lfs }}
 
     - name: Set up Docker Buildx
       uses: docker/setup-buildx-action@v1