[ci] Clean-up .gitlab-ci.yml to use new build infrastructure

.gitlab-ci.yml

-stages:
-  - build
+# This build file uses template features from YAML so it is generic enough for
+# any Bob project. Don't modify it unless you know what you're doing.
 
+# Definition of global variables (all stages)
 variables:
+  CONDA_ROOT: "${CI_PROJECT_DIR}/miniconda"
+  DOCKER_REGISTRY: docker.idiap.ch
   TEST_PREFIX_PATH_FILE: 'test_prefix_$CI_JOB_ID.txt'
-  CONDA_ENV_NAME: beat_test_env
-  CONDA_PREFIX: /local/opt/conda
-  PREFIX: $CONDA_PREFIX/envs/$CONDA_ENV_NAME
 
-build:
+
+# Definition of our build pipeline order
+stages:
+  - build
+
+
+# Build targets
+.build_template: &build_job
   stage: build
-  except:
-    - /^v\d+\.\d+\.\d+([abc]\d*)?$/  # PEP-440 compliant version (tags)
   before_script:
-  - ${PREFIX}/bin/python --version
-  - docker info
-  - git clean -ffdx
-  - export BEAT_TEST_PREFIX=`mktemp -d --tmpdir=/var/tmp beat_test_prefix.XXXXXXXXX`
-  - echo $BEAT_TEST_PREFIX > $TEST_PREFIX_PATH_FILE
-  - export PATH="$CONDA_PREFIX/bin:$PATH"
-  - source activate $CONDA_ENV_NAME
-  - conda info --envs
+    - mkdir _ci
+    - curl --silent "https://gitlab.idiap.ch/bob/bob.admin/raw/master/gitlab/install.sh" > _ci/install.sh
+    - chmod 755 _ci/install.sh
+    - ./_ci/install.sh _ci master #installs ci support scripts
+    - ./_ci/before_build.sh
+    - docker info
+    - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN docker.idiap.ch
+    - export BEAT_TEST_PREFIX=`mktemp -d --tmpdir=/var/tmp beat_test_prefix.XXXXXXXXX`
+    - echo $BEAT_TEST_PREFIX > $TEST_PREFIX_PATH_FILE
+    - ./scripts/before_build.sh
   script:
-  - ${PREFIX}/bin/python bootstrap-buildout.py
-  - ./bin/buildout
-  - export COVERAGE_FILE=.coverage.django
-  - ./bin/python ${PREFIX}/bin/coverage run --source=${CI_PROJECT_NAME} ./bin/django test --settings=beat.web.settings.ci -v 2
-  - export BEAT_CMDLINE_TEST_PLATFORM=django://beat.web.settings.ci
-  - export COVERAGE_FILE=.coverage.cmdline
-  - export NOSE_WITH_COVERAGE=1
-  - export NOSE_COVER_PACKAGE=beat.web
-  - ./bin/python ${PREFIX}/bin/coverage run --source=./src/beat.cmdline ./bin/nosetests -sv beat.cmdline
-  - unset COVERAGE_FILE
-  - ./bin/python ${PREFIX}/bin/coverage combine .coverage.django .coverage.cmdline
-  - ./bin/python ${PREFIX}/bin/coverage report
-  - ./bin/python ${PREFIX}/bin/sphinx-apidoc --separate -d 2 --output=doc/api ${CI_PROJECT_NAMESPACE} beat/web/*/migrations beat/web/*/tests
-  - ./bin/python ${PREFIX}/bin/sphinx-build doc/api html/api
-  - ./bin/python ${PREFIX}/bin/sphinx-build doc/admin html/admin
-  - ./bin/python ${PREFIX}/bin/sphinx-build doc/user html/user
+    - ./scripts/build.sh
   after_script:
-  - export BEAT_TEST_PREFIX=`cat $TEST_PREFIX_PATH_FILE`
-  - echo "Deleting BEAT test prefix $BEAT_TEST_PREFIX"
-  - rm -rf $BEAT_TEST_PREFIX $TEST_PREFIX_PATH_FILE
-  - unset BEAT_TEST_PREFIX
+    - ./scripts/after_build.sh
+    - ./_ci/after_build.sh
+  cache: &build_caches
+    paths:
+      - miniconda.sh
+      - ${CONDA_ROOT}/pkgs/*.tar.bz2
+      - ${CONDA_ROOT}/pkgs/urls.txt
+
+
+.build_linux_template: &linux_build_job
+  <<: *build_job
   tags:
-  - docker
+    - docker-build
+  cache:
+    <<: *build_caches
+    key: "linux-cache"
+
+
+build_linux_36:
+  <<: *linux_build_job
+  variables:
+    PYTHON_VERSION: "2.7"
+  except:
+    - /^v\d+\.\d+\.\d+([abc]\d*)?$/  # PEP-440 compliant version (tags)
+  artifacts:
+    expire_in: 1 week
+    paths:
+      - sphinx