Fix coursier cache permissions for bootcamp user

The coursier cache directory was owned by root, causing permission
denied errors when the bootcamp user tried to write lock files.

Changes:
- Add: RUN chown -R bootcamp:bootcamp /coursier_cache
- Fixes: "Permission denied" error on .structure.lock

Error: /coursier_cache/.structure.lock (Permission denied)

Author: jserv

Dockerfile

@@ -64,6 +64,7 @@ COPY --from=intermediate-builder /usr/local/share/jupyter/kernels/scala/ /usr/lo
 
 RUN chown -R bootcamp:bootcamp /chisel-bootcamp
 RUN chown -R bootcamp:bootcamp /jupyter
+RUN chown -R bootcamp:bootcamp /coursier_cache
 
 USER bootcamp
 WORKDIR /chisel-bootcamp