fix: create store directory and add minio dependency for tutorials

The 06-object-storage tutorial fails because datajoint.json configures
a local store at /tmp/datajoint-tutorials which doesn't exist in the
Docker container. Create it before executing notebooks. Also add minio
as a dependency so it's ready if needed.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: dimitri-yatsenko

docker-compose.yaml

@@ -73,6 +73,8 @@ services:
         condition: service_healthy
       postgres:
         condition: service_healthy
+      minio:
+        condition: service_healthy
     command:
       - sh
       - -c
@@ -94,13 +96,15 @@ services:
             # EXECUTE_PG mode: execute notebooks against PostgreSQL
             pip install -e "/datajoint-python[postgres]"
             pip install scikit-image pooch nbconvert matplotlib faker zarr
+            mkdir -p /tmp/datajoint-tutorials
             echo "Executing notebooks against PostgreSQL..."
             export DJ_HOST=postgres
             python scripts/execute_notebooks.py --backend postgresql
         elif echo "$${MODE}" | grep -i execute &>/dev/null; then
             # EXECUTE mode: execute notebooks against MySQL (default)
             pip install -e /datajoint-python
             pip install scikit-image pooch nbconvert matplotlib faker zarr
+            mkdir -p /tmp/datajoint-tutorials
             echo "Executing notebooks against MySQL..."
             python scripts/execute_notebooks.py --backend mysql
         else