Problem: Travis CI does not run anymore

Solution: remove useless configs

.travis.yml

-language: minimal
-
-jobs:
-  include:
-    - language: python
-      python: 2.7
-      env: BUILD_TYPE=bare_machines
-    - language: python
-      python: 3.5
-      env: BUILD_TYPE=bare_machines
-    - language: python
-      python: 3.6
-      env: BUILD_TYPE=bare_machines
-    - language: python
-      python: 3.7
-      env: BUILD_TYPE=bare_machines
-    - language: python
-      python: 3.8
-      env: BUILD_TYPE=bare_machines
-    - language: python
-      python: 3.9
-      env: BUILD_TYPE=bare_machines
-    - language: minimal
-      env: BUILD_TYPE=debian_sys_container
-    - language: minimal
-      env: PYTHON_VER=2.7 BUILD_TYPE=centos_containers
-    - language: minimal
-      env: PYTHON_VER=3.5 BUILD_TYPE=centos_containers
-    - language: minimal
-      env: PYTHON_VER=3.6 BUILD_TYPE=centos_containers
-    - language: minimal
-      env: PYTHON_VER=3.7 BUILD_TYPE=centos_containers
-    - language: minimal
-      env: PYTHON_VER=3.8 BUILD_TYPE=centos_containers
-    - language: minimal
-      env: PYTHON_VER=3.9 BUILD_TYPE=centos_containers
-    - language: minimal
-      env: PYTHON_VER=3.10 BUILD_TYPE=centos_containers
-    - language: minimal
-      env: PYTHON_VER=2.7 BUILD_TYPE=debian_containers
-    - language: minimal
-      env: PYTHON_VER=3.5 BUILD_TYPE=debian_containers
-    - language: minimal
-      env: PYTHON_VER=3.6 BUILD_TYPE=debian_containers
-    - language: minimal
-      env: PYTHON_VER=3.7 BUILD_TYPE=debian_containers
-    - language: minimal
-      env: PYTHON_VER=3.8 BUILD_TYPE=debian_containers
-    - language: minimal
-      env: PYTHON_VER=3.9 BUILD_TYPE=debian_containers
-    - language: minimal
-      env: PYTHON_VER=3.10 BUILD_TYPE=debian_containers
-  allow_failures:
-    - language: minimal
-      env: PYTHON_VER=3.10 BUILD_TYPE=centos_containers
-    - language: minimal
-      env: PYTHON_VER=3.10 BUILD_TYPE=debian_containers
-
-services:
-    - docker
-
-notifications:
-  email:
-    - buildout-development@googlegroups.com
-
-script:
-    - 'if [ "$TRAVIS_PULL_REQUEST" = "false" ]; then bash ./.travis/docker_login_on_non_pull_requests.sh; fi'
-    - ./ci_build.sh
-
-env:
-  global:
-    secure: Ck5Ww5VaX5NgZBDAwroFVzFKTlQJpb8HN1AIuMlJJkpL/oLpBuCVEKoa5/WK9MJYBd/+FopclNldC1OZeP1QZoAq2eeULtoeSY+4XVBJbZlFF2jJeDvmrjATszYAf/hH9FroVBpJkTJqgfXxeAgErD32Rm4aS7aQusNSd5HKKQA=

.travis/docker_login_on_non_pull_requests.sh

-echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin