Workaround github actions vs nongnu error

.github/workflows/bwrap.yml

@@ -22,6 +22,9 @@ jobs:
         uses: actions/checkout@v3
         with:
           submodules: recursive
+          # There is a strange bug(?) in nongnu, when you clone a git repository
+          # against a commit != HEAD with depth=1, it errors out.
+          fetch-depth: 0
       - name: Query cache for sources
         id: cache
         uses: actions/cache/restore@v3