Update .gitlab-ci.yml

.gitlab-ci.yml

@@ -22,6 +22,7 @@ generate-pipeline:
   stage: generate
   before_script:
     # clone spack and set checkout to correct ref
+    - pip3 install boto3
     - git clone ${SPACK_REPO}
     - pushd spack && git checkout ${SPACK_REF} && git log -n 1 && popd
     - . "./spack/share/spack/setup-env.sh"