Removed centos7 builds (EOL)

Signed-off-by: Nikos Mavrogiannopoulos <n.mavrogiannopoulos@gmail.com>

.gitlab-ci.yml

@@ -13,8 +13,6 @@ variables:
   UBUNTU22_BUILD: buildenv-ubuntu22
   CENTOS8_BUILD: buildenv-centos8
   CENTOS9_BUILD: buildenv-centos9
-  CENTOS7_BUILD: buildenv-centos7
-  CENTOS6_BUILD: buildenv-centos6
   MINIMALCONFIG: "--without-protobuf --without-libtalloc-prefix --without-libnl --without-maxmind --without-geoip --without-libreadline-prefix --without-liboath --without-libc-prefix --without-pam --without-radius --without-libcrypt-prefix --without-utmp --without-libutil-prefix --without-libwrap --without-libwrap-prefix --without-libseccomp-prefix --without-libsystemd-prefix --without-llhttp --without-lz4 --without-gssapi --without-pcl-lib --disable-rpath --disable-seccomp --disable-anyconnect-compat --disable-compression"
   JOBS: 2
 
@@ -165,27 +163,6 @@ Centos9:
       - ./*.log
       - ./tests/*.log
 
-Centos7:
-  stage: testing
-  image: $CI_REGISTRY/$BUILD_IMAGES_PROJECT:$CENTOS7_BUILD
-  script:
-  - git submodule update --init
-  - autoreconf -fvi
-  - ./configure
-  - make -j$JOBS
-  - make check -j$JOBS
-  tags:
-  - saas-linux-small-amd64
-  except:
-  - tags
-  - schedules
-  artifacts:
-    expire_in: 1 week
-    when: on_failure
-    paths:
-      - ./*.log
-      - ./tests/*.log
-
 Coverity:
   stage: preliminaries
   image: $CI_REGISTRY/$BUILD_IMAGES_PROJECT:$CENTOS8_BUILD
@@ -316,7 +293,7 @@ seccomp/Fedora:
 
 minimal:
   stage: testing
-  image: $CI_REGISTRY/$BUILD_IMAGES_PROJECT:$CENTOS7_BUILD
+  image: $CI_REGISTRY/$BUILD_IMAGES_PROJECT:$CENTOS8_BUILD
   script:
   - git submodule update --init
   - autoreconf -fvi