Drop test on centos7 (not working and not supported)

.gitlab-ci.yml

@@ -6,44 +6,6 @@ variables:
   NO_CONTRIB: "1"
   TARGET_BRANCH: master
 
-centos7:
-  tags:
-    - cvmfs
-  except:
-    - tags
-  image: gitlab-registry.cern.ch/lhcb-docker/python-deployment:centos7
-  variables:
-    BINARY_TAG: x86_64-centos7-gcc12-opt
-  script:
-    - yum install -y make bzip2 zip unzip gcc-c++ ccache python-pip python-wheel
-    - zip --version
-    - python --version
-    - pip install -e .
-    - pip install pytest pytest-cov
-    # this is missing in lbinstall 2.0.16 (https://gitlab.cern.ch/lhcb-core/lbinstall/-/merge_requests/86)
-    - pip install zstandard
-    # make sure we use the right cacert file in all cases
-    - export SSL_CERT_FILE=$(python -m certifi)
-    # Patch the cacert file with CERN certificates
-    - cat cern_ca_bundle.crt >> $SSL_CERT_FILE
-    - eval $(python -m LbEnv --sh -r /cvmfs/lhcb.cern.ch/lib)
-    - export PATH=/cvmfs/lhcb.cern.ch/lib/contrib/CMake/3.19.3/Linux-x86_64/bin:/cvmfs/lhcb.cern.ch/lib/contrib/ninja/1.8.2.g81279.kitware.dyndep-1.jobserver-1/Linux-x86_64:$PATH
-    - git config --global user.email "you@example.com"
-    - git config --global user.name "Your Name"
-    - pytest
-  artifacts:
-    when: always
-    paths:
-      - htmlcov
-      - pytest.xml
-      - coverage.xml
-    reports:
-      junit: pytest.xml
-      coverage_report:
-        coverage_format: cobertura
-        path: coverage.xml
-    expire_in: 1 week
-
 el9:
   tags:
     - cvmfs