Try another workaround to build docs

Signed-off-by: Maksym Pavlenko <pavlenko.maksym@gmail.com>

Author: mxpv

.github/workflows/docs.yml

@@ -33,7 +33,7 @@ jobs:
     # I don't know why this is needed for the docs to succeed on CI, but otherwise it consistently fails with:
     #   error: unable to open directory '.zig-cache/b/': FileNotFound
     # See https://github.com/mxpv/luaz/actions/runs/16698403816/job/47265761593
-    - run: zig build
+    - run: sudo rm -rf /home/runner/.cache/zig/ || true
 
     - run: zig build docs