Test spack build using external dependencies

[BenjaminRodenberg]

Related to #86

Todo

• [ ] get test working
• [x] Make sure that permissions are reasonable, i.e. have a non-privileged user for testing to be able to reproduce error described in #86

[BenjaminRodenberg]

I tried building the spack base image, but ran into trouble with building boost, when building locally via docker build -t external-deps -f spack/ci-spack-pyprecice-external-deps-2004.dockerfile .:

==> Installing boost-1.77.0-ih2n3iejl2kufyybakahhq4tottejwer
==> No binary for boost-1.77.0-ih2n3iejl2kufyybakahhq4tottejwer found: installing from source
==> Fetching https://boostorg.jfrog.io/artifactory/main/release/1.77.0/source/boost_1_77_0.tar.bz2
==> Ran patch() for boost
==> boost: Executing phase: 'install'
==> Error: ProcessError: Command exited with status 1:
    './bootstrap.sh' '--prefix=/spack/opt/spack/linux-ubuntu20.04-x86_64/gcc-8.4.0/boost-1.77.0-ih2n3iejl2kufyybakahhq4tottejwer' '--with-toolset=gcc' '--with-libraries=regex,wave,test,thread,exception,system,date_time,graph,locale,chrono,log,serialization,filesystem,iostreams,random,timer,atomic,program_options,math' '--without-icu'
See build log for details:
  /tmp/root/spack-stage/spack-stage-boost-1.77.0-ih2n3iejl2kufyybakahhq4tottejwer/spack-build-out.txt

This needs some further investigation.