ci: checkout without LFS

.forgejo/workflows/on_pr.yaml

@@ -15,6 +15,9 @@ jobs:
     steps:
       # get the repo first
       - uses: https://code.forgejo.org/actions/checkout@v4
+        with:
+          # We don't actually care about LFS file contents, just their integrity.
+          lfs: false
       - run: nix build .#fmt --verbose
 
   # clippy is incredibly useful for making yer code better
@@ -26,6 +29,9 @@ jobs:
     steps:
       # get the repo first
       - uses: https://code.forgejo.org/actions/checkout@v4
+        with:
+          # We don't actually care about LFS file contents, just their integrity.
+          lfs: false
       - run: nix build .#clippy --verbose
   
   build:
@@ -35,5 +41,8 @@ jobs:
     steps:
       # get the repo first
       - uses: https://code.forgejo.org/actions/checkout@v4
+        with:
+          # We don't actually care about LFS file contents, just their integrity.
+          lfs: false
       - name: "Build it locally"
         run: nix build --verbose