move the clean process to after build

gitlab/after_build.sh

+#!/usr/bin/env bash
+
+source $(dirname ${0})/functions.sh
+
+# delete the bob packages from the cache otherwise the cache keeps increasing
+# over and over. See https://gitlab.idiap.ch/bob/bob.admin/issues/65
+rm -rf ${CONDA_ROOT}/pkgs/bob*.tar.bz2
+
+# run git clean to clean everything that is not needed. This helps to keep the
+# disk usage on CI machines to minimum.
+git clean -ffdx \
+    --exclude="miniconda.sh" \
+    --exclude="miniconda/pkgs/*.tar.bz2" \
+    --exclude="miniconda/pkgs/urls.txt" \
+    --exclude="miniconda/conda-bld/linux-64/*.tar.bz2" \
+    --exclude="miniconda/conda-bld/osx-64/*.tar.bz2" \
+    --exclude="_ci" \
+    --exclude="dist/*.zip" \
+    --exclude="sphinx"

gitlab/build.sh

 #!/usr/bin/env bash
-# Wed 21 Sep 2016 13:08:05 CEST
 
 source $(dirname ${0})/functions.sh
 
@@ -24,10 +23,3 @@ export_env BOB_BUILD_NUMBER
 run_cmd cp ./_ci/recipe_append.yaml conda/recipe_append.yaml
 
 run_cmd ${CONDA_ROOT}/bin/conda build --no-anaconda-upload --variant-config-files _ci/conda_build_config.yaml --python=${PYTHON_VERSION} conda
-
-# delete the bob packages from the cache otherwise the cache keeps increasing
-# over and over. See https://gitlab.idiap.ch/bob/bob.admin/issues/65
-run_cmd rm -rf ${CONDA_ROOT}/pkgs/bob*.tar.bz2
-
-# run git clean to clean everything that is not needed
-git clean -ffdx --exclude=miniconda.sh --exclude="miniconda/pkgs/*.tar.bz2" --exclude=miniconda/pkgs/urls.txt --exclude=_ci --exclude="miniconda/conda-bld/linux-64/*.tar.bz2" --exclude="miniconda/conda-bld/osx-64/*.tar.bz2" --exclude="dist/*.zip" --exclude=sphinx