updated dockerfiles to run commands to save space optimally

dockerfiles/Dockerfile.ubuntu

@@ -2,43 +2,61 @@
 FROM ubuntu:22.04
 LABEL Description="CORE Docker Ubuntu Image"
 
-# define variables
 ARG PREFIX=/usr/local
 ARG BRANCH=master
-
-# define environment
+ARG PROTOC_VERSION=3.19.6
+ARG VENV_PATH=/opt/core/venv
 ENV DEBIAN_FRONTEND=noninteractive
+ENV PATH="$PATH:${VENV_PATH}/bin"
+WORKDIR /opt
 
-# install basic dependencies
-RUN apt-get update && \
-    apt-get install -y git sudo wget tzdata
+# install system dependencies
+RUN apt-get update -y && \
+    apt-get install -y --no-install-recommends \
+    ca-certificates \
+    git \
+    sudo \
+    wget \
+    tzdata \
+    libpcap-dev \
+    libpcre3-dev \
+    libprotobuf-dev \
+    libxml2-dev \
+    protobuf-compiler \
+    unzip \
+    uuid-dev \
+    iproute2 \
+    iputils-ping \
+    tcpdump && \
+    apt-get autoremove -y
 
 # install core
-WORKDIR /opt
-RUN git clone https://github.com/coreemu/core
-WORKDIR /opt/core
-RUN git checkout ${BRANCH}
-RUN ./setup.sh
-RUN . /root/.bashrc && inv install -v -p ${PREFIX}
-ENV PATH "$PATH:/opt/core/venv/bin"
+RUN git clone https://github.com/coreemu/core && \
+    cd core && \
+    git checkout ${BRANCH} && \
+    ./setup.sh && \
+    . /root/.bashrc && \
+    inv install -v -p ${PREFIX} && \
+    cd /opt && \
+    rm -rf ospf-mdr
 
 # install emane
-RUN apt-get install -y libpcap-dev libpcre3-dev libprotobuf-dev libxml2-dev protobuf-compiler unzip uuid-dev
-WORKDIR /opt
-RUN git clone https://github.com/adjacentlink/emane.git
-RUN cd emane && \
-  ./autogen.sh && \
-  ./configure --prefix=/usr && \
-  make -j$(nproc)  && \
-  make install
-RUN wget https://github.com/protocolbuffers/protobuf/releases/download/v3.19.6/protoc-3.19.6-linux-x86_64.zip && \
+RUN wget https://github.com/protocolbuffers/protobuf/releases/download/v${PROTOC_VERSION}/protoc-${PROTOC_VERSION}-linux-x86_64.zip && \
     mkdir protoc && \
-    unzip protoc-3.19.6-linux-x86_64.zip -d protoc
-RUN PATH=/opt/protoc/bin:$PATH && \
-  cd emane/src/python && \
-  make clean && \
-  make
-RUN /opt/core/venv/bin/python -m pip install emane/src/python
+    unzip protoc-${PROTOC_VERSION}-linux-x86_64.zip -d protoc && \
+    git clone https://github.com/adjacentlink/emane.git && \
+    cd emane && \
+    ./autogen.sh && \
+    ./configure --prefix=/usr && \
+    make -j$(nproc)  && \
+    make install && \
+    cd src/python && \
+    make clean && \
+    PATH=/opt/protoc/bin:$PATH make && \
+    ${VENV_PATH}/bin/python -m pip install . && \
+    cd /opt && \
+    rm -rf protoc && \
+    rm -rf emane && \
+    rm -f protoc-${PROTOC_VERSION}-linux-x86_64.zip
 
-# run daemon
-CMD ["core-daemon"]
+WORKDIR /root