No longer create a custom sysimage

.binder/Dockerfile

@@ -140,21 +140,9 @@ RUN julia -e 'import Pkg; Pkg.add("MKL_jll"); using MKL_jll;'
 # install Cropbox-related packages
 RUN julia -e 'using Pkg; pkg"add CropRootBox Garlic LeafGasExchange SimpleCrop";'
 
-# create a system image with Cropbox built-in
-ENV CROPBOX_IMG=${CROPBOX_DIR}/cropbox.so
-RUN julia -e 'import Pkg; Pkg.add("PackageCompiler"); using PackageCompiler; create_sysimage(:Cropbox; sysimage_path="'${CROPBOX_IMG}'", precompile_execution_file="'${REPO_DIR}'/.binder/precompile.jl", cpu_target=PackageCompiler.default_app_cpu_target());' || exit 1
-
-# update IJulia kernel with custom system image
-RUN julia -e 'using IJulia; installkernel("Julia", "--project='${HOME}'", "--sysimage='${CROPBOX_IMG}'");'
-
 # clean up as root
 USER root
 
-# create a wrapper for Julia REPL with custom system image
-RUN rm /usr/local/bin/julia && \
-    echo -e '#!/bin/bash\n/opt/julia-'${JULIA_VERSION}'/bin/julia -J'${CROPBOX_IMG} '"$@"' > /usr/local/bin/julia && \
-    chmod +x /usr/local/bin/julia
-
 RUN chown -R ${NB_USER}:users ${HOME} && \
     chown -R ${NB_USER}:users ${JULIA_DEPOT_PATH}