Installs toml dependency in Dockerfile.base (#239)

# Description

Install `toml` dependency in docker file. This prevents the
`ModuleNotFoundError: No module named 'toml'` error when installing
isaac lab dependencies in the docker build process.

docker/Dockerfile.base

@@ -53,6 +53,9 @@ COPY ../ ${ISAACLAB_PATH}
 # Set up a symbolic link between the installed Isaac Sim root folder and _isaac_sim in the Isaac Lab directory
 RUN ln -sf ${ISAACSIM_ROOT_PATH} ${ISAACLAB_PATH}/_isaac_sim
 
+# Install toml dependency
+RUN ${ISAACLAB_PATH}/isaaclab.sh -p -m pip install toml
+
 # Install apt dependencies for extensions that declare them in their extension.toml
 RUN --mount=type=cache,target=/var/cache/apt \
     ${ISAACLAB_PATH}/isaaclab.sh -p ${ISAACLAB_PATH}/tools/install_deps.py apt ${ISAACLAB_PATH}/source && \