doc: add how to use it for getting LFS

README.md

@@ -33,3 +33,21 @@ jobs:
           input: 'compsoc_public'
           token: ${{ secrets.API_TOKEN_FORGEJO }}
 ```
+
+### Get LFS
+````yaml
+jobs:
+  build:
+    # build it using teh base nixos system, helps with caching
+    runs-on: nix
+    steps:
+      # get the repo first
+      - uses: https://code.forgejo.org/actions/checkout@v4
+      - name: "Get LFS objects"
+        uses: https://forgejo.skynet.ie/Skynet/actions-deploy-to-skynet/get_lfs@v3
+        with:
+          repository: ${{ gitea.repository }}
+          ref_name: ${{ gitea.ref_name }}
+      - name: "Build it locally"
+        run: nix build --verbose
+````