some more improvements

bsp_linux/Dockerfile

@@ -1,8 +1,7 @@
 FROM ubuntu:latest
 # FROM alpine:latest
 
-RUN apt-get update -y && apt-get upgrade -y
-RUN apt-get install -y cmake g++
+RUN apt-get update && apt-get install -y cmake g++
 # RUN apk add cmake make g++
 
 WORKDIR /usr/src/app
@@ -16,3 +15,4 @@ RUN set -ex; \
 
 ENTRYPOINT ["cmake", "--build", "build-linux"]
 CMD ["-j"]
+# CMD ["bash"]