[FIX] Add a scheduled workflow to automatically update the pixilock f…

…ile (#9)

* Update `pixi` lockfile in CI

* Use uniquely named branches when opening PRs

* Install `pixi-diff-to-markdown` via `pixi`

.github/workflows/update_pixi_lockfile.yml

@@ -28,7 +28,7 @@ jobs:
       - name: Update pixi lockfile and generate diff
         run: |
           set -o pipefail
-          pixi update --json --no-install | pixi exec pixi-diff-to-markdown --explicit-column=true --hide=false > diff.md
+          pixi update --json --no-install | pixi exec pixi-diff-to-markdown --explicit-column --hide=false > diff.md
 
       - name: Configure Git for LFS
         run: |