fix bug : docker build error with no permission with this floder (#6226)

要提交的变更：
	修改：     contrib/docker/Dockerfile

contrib/docker/Dockerfile

@@ -35,6 +35,7 @@ WORKDIR $HOME/incubator-superset
 
 COPY ./ ./
 
+RUN RUN mkdir -p /home/work/.cache
 RUN pip install --upgrade setuptools pip
 RUN pip install -r requirements.txt
 RUN pip install -r requirements-dev.txt