Simplify Dockerfile

Dockerfile

@@ -1,7 +1,4 @@
 FROM ubuntu:noble
-ARG ANGR_VERSION
-
-ENV DEBIAN_FRONTEND=noninteractive
 
 RUN apt-get update \
     && apt-get -o APT::Immediate-Configure=0 install -y python3-dev python3-venv \
@@ -12,9 +9,8 @@ USER angr
 WORKDIR /home/angr
 
 RUN python3 -m venv --prompt angr .venv
-RUN bash -c "source .venv/bin/activate && pip install -U pip"
-RUN bash -c "source .venv/bin/activate && pip install setuptools"  # Required for capstone with pyhton 3.12
-RUN bash -c "source .venv/bin/activate && pip install angr[AngrDB,pcode]==${ANGR_VERSION}"
 RUN echo "source /home/angr/.venv/bin/activate" >> /home/angr/.bashrc
+RUN /home/angr/.venv/bin/pip install -U pip setuptools  # setuptools required for capstone with python 3.12
 
-CMD ["/bin/bash"]
+ARG ANGR_VERSION
+RUN /home/angr/.venv/bin/pip install angr[AngrDB,pcode]==${ANGR_VERSION}