remove all packages we don't need

closes #25

Dockerfile

@@ -11,16 +11,11 @@ RUN echo 'debconf debconf/frontend select Noninteractive' | debconf-set-selectio
 # install available updates
 RUN apt-get update && apt-get --assume-yes upgrade && apt-get clean
 
-# support https repositories
+# install basic utilities
 RUN apt-get --assume-yes install \
-      apt-transport-https \
-      apt-utils \
-      bash-completion \
       curl \
       gpg \
-      lsb-release \
-      wget && \
-    apt-get clean
+    && apt-get clean
 
 # add lscsoft repo
 RUN echo "deb [trusted=yes] https://hypatia.aei.mpg.de/lsc-amd64-bookworm ./" > /etc/apt/sources.list.d/lscsoft.list
@@ -30,10 +25,10 @@ RUN curl https://research.cs.wisc.edu/htcondor/repo/keys/HTCondor-23.x-Key | gpg
     echo "deb [signed-by=/usr/share/keyrings/HTCondor-23.x.gpg] https://research.cs.wisc.edu/htcondor/repo/debian/23.x bookworm main" > /etc/apt/sources.list.d/htcondor.list
 
 # add pegasus repo
-RUN curl -s https://download.pegasus.isi.edu/pegasus/gpg.txt | gpg --dearmor --yes --output /usr/share/keyrings/Pegasus.gpg && \
+RUN curl -sSL https://download.pegasus.isi.edu/pegasus/gpg.txt | gpg --dearmor --yes --output /usr/share/keyrings/Pegasus.gpg && \
     echo 'deb [signed-by=/usr/share/keyrings/Pegasus.gpg] https://download.pegasus.isi.edu/wms/download/debian bookworm main' | tee /etc/apt/sources.list.d/pegasus.list
 
 # add cvmfs repo
-RUN wget https://ecsft.cern.ch/dist/cvmfs/cvmfs-release/cvmfs-release-latest_all.deb && \
+RUN curl -sSLO https://ecsft.cern.ch/dist/cvmfs/cvmfs-release/cvmfs-release-latest_all.deb && \
     dpkg -i cvmfs-release-latest_all.deb && \
     rm -f cvmfs-release-latest_all.deb